This semi-annual shareholder report contains important information about BlackRock Managed Income Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441-7762.

Material Fund Change Notice [Text Block]

Additional Information Website

blackrock.com/fundreports

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class K Shares	$17	0.33%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 17

Expense Ratio, Percent

0.33%

^[1]

AssetsNet

$ 801,020,867

Holdings Count | Holding

1,838

InvestmentCompanyPortfolioTurnover

44.00%

Additional Fund Statistics [Text Block]

Key Fund statistics

Net Assets........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	$801,020,867
Number of Portfolio Holdings........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	1,838
Portfolio Turnover Rate........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	44%

Holdings [Text Block]

Portfolio composition

Credit quality allocation

Investment Type	Percent of Total Investments^{Footnote Reference(a)}
Corporate Bonds........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	26.6%
Investment Companies........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	21.8
Floating Rate Loan Interests........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	13.6
Common Stocks........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	12.6
Asset-Backed Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	11.0
Equity-Linked Notes........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	7.3
Non-Agency Mortgage-Backed Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	6.8
Foreign Government Obligations........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Preferred Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Fixed Rate Loan Interests........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Other^{Footnote Reference(b)}........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	-

Credit Rating^{Footnote Reference(c)}	Percent of Total Investments^{Footnote Reference(a)}
AAA/Aaa^{Footnote Reference(d)}........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	11.7%
AA/Aa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	18.3
A........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	21.0
BBB/Baa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	20.7
BB/Ba........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	5.4
B........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	7.8
CCC/Caa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.3
CC/Ca........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
N/R........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	14.7

Footnote	Description
Footnote^(a)	Excludes short-term securities.
Footnote^(b)	Ten largest investment types are presented. Additional investment types are found in Other.
Footnote^(c)	For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.
Footnote^(d)	The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.

C000050721

Shareholder Report [Line Items]

Fund Name

BlackRock Managed Income Fund

Class Name

Institutional Shares

Trading Symbol

BLDIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about BlackRock Managed Income Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441-7762.

Material Fund Change Notice [Text Block]

Additional Information Website

blackrock.com/fundreports

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Institutional Shares	$19	0.38%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 19

Expense Ratio, Percent

0.38%

^[2]

AssetsNet

$ 801,020,867

Holdings Count | Holding

1,838

InvestmentCompanyPortfolioTurnover

44.00%

Additional Fund Statistics [Text Block]

Key Fund statistics

Net Assets........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	$801,020,867
Number of Portfolio Holdings........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	1,838
Portfolio Turnover Rate........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	44%

Holdings [Text Block]

Portfolio composition

Credit quality allocation

Investment Type	Percent of Total Investments^{Footnote Reference(a)}
Corporate Bonds........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	26.6%
Investment Companies........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	21.8
Floating Rate Loan Interests........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	13.6
Common Stocks........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	12.6
Asset-Backed Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	11.0
Equity-Linked Notes........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	7.3
Non-Agency Mortgage-Backed Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	6.8
Foreign Government Obligations........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Preferred Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Fixed Rate Loan Interests........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Other^{Footnote Reference(b)}........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	-

Credit Rating^{Footnote Reference(c)}	Percent of Total Investments^{Footnote Reference(a)}
AAA/Aaa^{Footnote Reference(d)}........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	11.7%
AA/Aa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	18.3
A........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	21.0
BBB/Baa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	20.7
BB/Ba........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	5.4
B........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	7.8
CCC/Caa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.3
CC/Ca........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
N/R........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	14.7

Footnote	Description
Footnote^(a)	Excludes short-term securities.
Footnote^(b)	Ten largest investment types are presented. Additional investment types are found in Other.
Footnote^(c)	For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.
Footnote^(d)	The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.

C000050722

Shareholder Report [Line Items]

Fund Name

BlackRock Managed Income Fund

Class Name

Investor A Shares

Trading Symbol

BLADX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about BlackRock Managed Income Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441-7762.

Material Fund Change Notice [Text Block]

Additional Information Website

blackrock.com/fundreports

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Investor A Shares	$32	0.63%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 32

Expense Ratio, Percent

0.63%

^[3]

AssetsNet

$ 801,020,867

Holdings Count | Holding

1,838

InvestmentCompanyPortfolioTurnover

44.00%

Additional Fund Statistics [Text Block]

Key Fund statistics

Net Assets........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	$801,020,867
Number of Portfolio Holdings........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	1,838
Portfolio Turnover Rate........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	44%

Holdings [Text Block]

Portfolio composition

Credit quality allocation

Investment Type	Percent of Total Investments^{Footnote Reference(a)}
Corporate Bonds........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	26.6%
Investment Companies........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	21.8
Floating Rate Loan Interests........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	13.6
Common Stocks........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	12.6
Asset-Backed Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	11.0
Equity-Linked Notes........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	7.3
Non-Agency Mortgage-Backed Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	6.8
Foreign Government Obligations........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Preferred Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Fixed Rate Loan Interests........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Other^{Footnote Reference(b)}........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	-

Credit Rating^{Footnote Reference(c)}	Percent of Total Investments^{Footnote Reference(a)}
AAA/Aaa^{Footnote Reference(d)}........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	11.7%
AA/Aa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	18.3
A........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	21.0
BBB/Baa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	20.7
BB/Ba........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	5.4
B........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	7.8
CCC/Caa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.3
CC/Ca........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
N/R........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	14.7

Footnote	Description
Footnote^(a)	Excludes short-term securities.
Footnote^(b)	Ten largest investment types are presented. Additional investment types are found in Other.
Footnote^(c)	For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.
Footnote^(d)	The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.

C000174022

Shareholder Report [Line Items]

Fund Name

BlackRock Managed Income Fund

Class Name

Investor C Shares

Trading Symbol

BMICX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about BlackRock Managed Income Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441-7762.

Material Fund Change Notice [Text Block]

Additional Information Website

blackrock.com/fundreports

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Investor C Shares	$70	1.38%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 70

Expense Ratio, Percent

1.38%

^[4]

AssetsNet

$ 801,020,867

Holdings Count | Holding

1,838

InvestmentCompanyPortfolioTurnover

44.00%

Additional Fund Statistics [Text Block]

Key Fund statistics

Net Assets........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	$801,020,867
Number of Portfolio Holdings........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	1,838
Portfolio Turnover Rate........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	44%

Holdings [Text Block]

Portfolio composition

Credit quality allocation

Investment Type	Percent of Total Investments^{Footnote Reference(a)}
Corporate Bonds........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	26.6%
Investment Companies........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	21.8
Floating Rate Loan Interests........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	13.6
Common Stocks........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	12.6
Asset-Backed Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	11.0
Equity-Linked Notes........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	7.3
Non-Agency Mortgage-Backed Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	6.8
Foreign Government Obligations........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Preferred Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Fixed Rate Loan Interests........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
Other^{Footnote Reference(b)}........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	-

Credit Rating^{Footnote Reference(c)}	Percent of Total Investments^{Footnote Reference(a)}
AAA/Aaa^{Footnote Reference(d)}........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	11.7%
AA/Aa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	18.3
A........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	21.0
BBB/Baa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	20.7
BB/Ba........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	5.4
B........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	7.8
CCC/Caa........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.3
CC/Ca........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	0.1
N/R........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................	14.7

Footnote	Description
Footnote^(a)	Excludes short-term securities.
Footnote^(b)	Ten largest investment types are presented. Additional investment types are found in Other.
Footnote^(c)	For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.
Footnote^(d)	The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.

C000220895

Shareholder Report [Line Items]

Fund Name

BlackRock Retirement Income 2030 Fund

Class Name

Institutional Shares

Trading Symbol

BRICX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about BlackRock Retirement Income 2030 Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441-7762.

Material Fund Change Notice [Text Block]

Additional Information Website

blackrock.com/fundreports

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Institutional Shares	$13^{Footnote Reference(a)}	0.25%^{Footnote Reference(a)}^{Footnote Reference(b)}

Footnote	Description
Footnote^(a)	Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.
Footnote^(b)	Annualized.

Expenses Paid, Amount

$ 13

^[5]

Expense Ratio, Percent

0.25%

^[5],[6]

AssetsNet

$ 4,573,555

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

0.00%

Holdings [Text Block]

Portfolio composition

Investment Type

  Percent of 
Affiliated Investment
Companies

Fixed-Income Funds........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

98.5%

Short-Term Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

1.5

C000220896

Shareholder Report [Line Items]

Fund Name

BlackRock Retirement Income 2030 Fund

Class Name

Investor A Shares

Trading Symbol

BRIAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about BlackRock Retirement Income 2030 Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441-7762.

Material Fund Change Notice [Text Block]

Additional Information Website

blackrock.com/fundreports

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Investor A Shares	$26^{Footnote Reference(a)}	0.50%^{Footnote Reference(a)}^{Footnote Reference(b)}

Footnote	Description
Footnote^(a)	Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.
Footnote^(b)	Annualized.

Expenses Paid, Amount

$ 26

^[7]

Expense Ratio, Percent

0.50%

^[7],[8]

AssetsNet

$ 4,573,555

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

0.00%

Holdings [Text Block]

Portfolio composition

Investment Type

  Percent of 
Affiliated Investment
Companies

Fixed-Income Funds........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

98.5%

Short-Term Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

1.5

C000220897

Shareholder Report [Line Items]

Fund Name

BlackRock Retirement Income 2040 Fund

Class Name

Institutional Shares

Trading Symbol

BRIEX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about BlackRock Retirement Income 2040 Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

On May 20, 2025, the Fund's Board approved the closure of the Fund to new and subsequent investments and thereafter to liquidate the Fund. Accordingly, effective July 11, 2025, the Fund no longer accepted purchase orders and the Fund was terminated on July 18, 2025.

Material Fund Change Notice [Text Block]

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Institutional Shares	$13^{Footnote Reference(a)}	0.25%^{Footnote Reference(a)}^{Footnote Reference(b)}

Footnote	Description
Footnote^(a)	Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.
Footnote^(b)	Annualized.

Expenses Paid, Amount

$ 13

^[9]

Expense Ratio, Percent

0.25%

^[9],[10]

AssetsNet

$ 4,738,169

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

0.00%

Holdings [Text Block]

Portfolio composition

Investment Type

  Percent of 
Affiliated Investment
Companies

Fixed-Income Funds........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

98.4%

Short-Term Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

1.6

C000220898

Shareholder Report [Line Items]

Fund Name

BlackRock Retirement Income 2040 Fund

Class Name

Investor A Shares

Trading Symbol

BRIDX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about BlackRock Retirement Income 2040 Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

Material Fund Change Notice [Text Block]

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Investor A Shares	$26^{Footnote Reference(a)}	0.50%^{Footnote Reference(a)}^{Footnote Reference(b)}

Footnote	Description
Footnote^(a)	Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.
Footnote^(b)	Annualized.

Expenses Paid, Amount

$ 26

^[11]

Expense Ratio, Percent

0.50%

^[11],[12]

AssetsNet

$ 4,738,169

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

0.00%

Holdings [Text Block]

Portfolio composition

Investment Type

  Percent of 
Affiliated Investment
Companies

Fixed-Income Funds........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

98.4%

Short-Term Securities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

1.6

[1]	Annualized.
[2]	Annualized.
[3]	Annualized.
[4]	Annualized.
[5]	Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.
[6]	Annualized.
[7]	Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.
[8]	Annualized.
[9]	Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.
[10]	Annualized.
[11]	Excludes fees and expenses incurred indirectly as a result of investments in underlying funds.
[12]	Annualized.