v3.25.2
Shareholder Report
12 Months Ended
May 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name BlackRock Funds II
Entity Central Index Key 0001398078
Entity Investment Company Type N-1A
Document Period End Date May 31, 2025
C000058057 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Global Dividend Portfolio
Class Name Institutional Shares
Trading Symbol BIBDX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BlackRock Global Dividend Portfolio (the “Fund”) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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.
Additional Information Phone Number (800) 441‑7762
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the last year?
(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 $84 0.80%
Expenses Paid, Amount $ 84
Expense Ratio, Percent 0.80%
Factors Affecting Performance [Text Block]
How did the Fund perform last year?
  • For the reporting period ended May 31, 2025, the Fund's Institutional Shares returned 9.61%.
  • For the same period, the Fund’s benchmark, the MSCI All Country World Index, returned 13.65%.
What contributed to performance?
In sector terms, leading contributors included stock selection in energy along with an overweight to, and stock selection within, materials. At the individual stock level, semiconductor company Broadcom Inc. had been a prime beneficiary of optimism around artificial intelligence (“AI”). Broadcom remains well-positioned as the market shifts toward application-specific chips, which are increasingly critical to improving AI model efficiency. Philip Morris International Inc. delivered strong results driven by the expansion of its smoke-free portfolio. The Fund exited the position due to rising competition in U.S. nicotine pouches and concerns that Philip Morris may need to cut prices to remain competitive. Shares of Spanish Bank BBVA rose notably since the start of 2025 as European financials have benefited from higher interest rates and plans for fiscal stimulus. In addition, BBVA posted earnings beats for both the fourth quarter of 2024 and first quarter of 2025, driven by its trading division.
What detracted from performance?
Stock selection in consumer discretionary weighed on return, along with overweights to, and stock selection within, healthcare and consumer staples. At the individual stock level, Novo Nordisk A/S declined on disappointing trial data for CagriSema, its next generation weight loss drug, along with market share gains by competitor Eli Lilly. The Fund continued to hold the stock given CagriSema’s comparable efficacy to Eli Lilly’s incumbent drug and the expanding weight loss market. Shares of U.S. managed care company United Health Group Inc. declined late in the period, following downgraded guidance driven by higher-than-expected claims activity. The current valuation appeared compelling given structural tailwinds for Medicare Advantage broadly and potential levers available to the company to help improve profitability. U.S. semiconductor manufacturer Texas Instruments Inc. declined sharply following weak fourth quarter 2024 results driven by softness in the industrial and auto markets, which led to elevated inventories and lower revenue and net income. The Fund exited the position.
The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future results.
Line Graph [Table Text Block]
Fund performance
Cumulative performance: June 1, 2015 through May 31, 2025
Initial investment of $10,000
Fund Performance - Growth of 10K
See “Average annual total returns” for additional information on fund performance.
Average Annual Return [Table Text Block]
Average annual total returns
1 Year 5 Years 10 Years
Institutional Shares 9.61 % 10.35 % 7.25 %
MSCI All Country World Index 13.65 13.37 9.25
No Deduction of Taxes [Text Block] Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares.
Updated Performance Information Location [Text Block] Visit blackrock.com for more recent performance information.
Net Assets $ 1,009,586,312
Holdings Count | Holding 48
Advisory Fees Paid, Amount $ 6,627,287
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $1,009,586,312
Number of Portfolio Holdings 48
Net Investment Advisory Fees $6,627,287
Portfolio Turnover Rate 44%
Holdings [Text Block]
What did the Fund invest in?
(as of May 31, 2025)
Geographic allocation
Country Percent of
Net Assets
United States 66.4 %
United Kingdom 10.8 %
Taiwan 5.3 %
France 3.8 %
Denmark 2.5 %
Spain 2.2 %
Canada 2.1 %
Netherlands 2.0 %
Switzerland 2.0 %
Japan 1.5 %
Short-Term Securities 1.6 %
Liabilities in Excess of Other Assets (0.2 )%
Ten largest holdings
Security(a) Percent of
Net Assets
Microsoft Corp. 5.9 %
Taiwan Semiconductor Manufacturing Co. Ltd. 3.9 %
Broadcom, Inc. 3.8 %
AstraZeneca PLC 3.4 %
Coca-Cola Co. (The) 2.8 %
Meta Platforms, Inc., Class A 2.7 %
Accenture PLC, Class A 2.7 %
Walmart, Inc. 2.7 %
CMS Energy Corp. 2.6 %
RELX PLC 2.6 %
(a)
Excludes short-term securities.
Largest Holdings [Text Block]
Ten largest holdings
Security(a) Percent of
Net Assets
Microsoft Corp. 5.9 %
Taiwan Semiconductor Manufacturing Co. Ltd. 3.9 %
Broadcom, Inc. 3.8 %
AstraZeneca PLC 3.4 %
Coca-Cola Co. (The) 2.8 %
Meta Platforms, Inc., Class A 2.7 %
Accenture PLC, Class A 2.7 %
Walmart, Inc. 2.7 %
CMS Energy Corp. 2.6 %
RELX PLC 2.6 %
(a)
Excludes short-term securities.
C000172902 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Global Dividend Portfolio
Class Name Class K Shares
Trading Symbol BKBDX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BlackRock Global Dividend Portfolio (the “Fund”) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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.
Additional Information Phone Number (800) 441‑7762
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the last year?
(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 $74 0.71%
Expenses Paid, Amount $ 74
Expense Ratio, Percent 0.71%
Factors Affecting Performance [Text Block]
How did the Fund perform last year?
  • For the reporting period ended May 31, 2025, the Fund's Class K Shares returned 9.68%.
  • For the same period, the Fund’s benchmark, the MSCI All Country World Index, returned 13.65%.
What contributed to performance?
In sector terms, leading contributors included stock selection in energy along with an overweight to, and stock selection within, materials. At the individual stock level, semiconductor company Broadcom Inc. had been a prime beneficiary of optimism around artificial intelligence (“AI”). Broadcom remains well-positioned as the market shifts toward application-specific chips, which are increasingly critical to improving AI model efficiency. Philip Morris International Inc. delivered strong results driven by the expansion of its smoke-free portfolio. The Fund exited the position due to rising competition in U.S. nicotine pouches and concerns that Philip Morris may need to cut prices to remain competitive. Shares of Spanish Bank BBVA rose notably since the start of 2025 as European financials have benefited from higher interest rates and plans for fiscal stimulus. In addition, BBVA posted earnings beats for both the fourth quarter of 2024 and first quarter of 2025, driven by its trading division.
What detracted from performance?
Stock selection in consumer discretionary weighed on return, along with overweights to, and stock selection within, healthcare and consumer staples. At the individual stock level, Novo Nordisk A/S declined on disappointing trial data for CagriSema, its next generation weight loss drug, along with market share gains by competitor Eli Lilly. The Fund continued to hold the stock given CagriSema’s comparable efficacy to Eli Lilly’s incumbent drug and the expanding weight loss market. Shares of U.S. managed care company United Health Group Inc. declined late in the period, following downgraded guidance driven by higher-than-expected claims activity. The current valuation appeared compelling given structural tailwinds for Medicare Advantage broadly and potential levers available to the company to help improve profitability. U.S. semiconductor manufacturer Texas Instruments Inc. declined sharply following weak fourth quarter 2024 results driven by softness in the industrial and auto markets, which led to elevated inventories and lower revenue and net income. The Fund exited the position.
The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future results.
Line Graph [Table Text Block]
Fund performance
Cumulative performance: June 1, 2015 through May 31, 2025
Initial investment of $10,000
Fund Performance - Growth of 10K
See “Average annual total returns” for additional information on fund performance.
Average Annual Return [Table Text Block]
Average annual total returns
1 Year 5 Years 10 Years
Class K Shares 9.68 % 10.42 % 7.31 %
MSCI All Country World Index 13.65 13.37 9.25
Performance Inception Date Jun. 08, 2016
No Deduction of Taxes [Text Block] Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares.
Updated Performance Information Location [Text Block] Visit blackrock.com for more recent performance information.
Net Assets $ 1,009,586,312
Holdings Count | Holding 48
Advisory Fees Paid, Amount $ 6,627,287
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $1,009,586,312
Number of Portfolio Holdings 48
Net Investment Advisory Fees $6,627,287
Portfolio Turnover Rate 44%
Holdings [Text Block]
What did the Fund invest in?
(as of May 31, 2025)
Geographic allocation
Country Percent of
Net Assets
United States 66.4 %
United Kingdom 10.8 %
Taiwan 5.3 %
France 3.8 %
Denmark 2.5 %
Spain 2.2 %
Canada 2.1 %
Netherlands 2.0 %
Switzerland 2.0 %
Japan 1.5 %
Short-Term Securities 1.6 %
Liabilities in Excess of Other Assets (0.2 )%
Ten largest holdings
Security(a) Percent of
Net Assets
Microsoft Corp. 5.9 %
Taiwan Semiconductor Manufacturing Co. Ltd. 3.9 %
Broadcom, Inc. 3.8 %
AstraZeneca PLC 3.4 %
Coca-Cola Co. (The) 2.8 %
Meta Platforms, Inc., Class A 2.7 %
Accenture PLC, Class A 2.7 %
Walmart, Inc. 2.7 %
CMS Energy Corp. 2.6 %
RELX PLC 2.6 %
(a)
Excludes short-term securities.
Largest Holdings [Text Block]
Ten largest holdings
Security(a) Percent of
Net Assets
Microsoft Corp. 5.9 %
Taiwan Semiconductor Manufacturing Co. Ltd. 3.9 %
Broadcom, Inc. 3.8 %
AstraZeneca PLC 3.4 %
Coca-Cola Co. (The) 2.8 %
Meta Platforms, Inc., Class A 2.7 %
Accenture PLC, Class A 2.7 %
Walmart, Inc. 2.7 %
CMS Energy Corp. 2.6 %
RELX PLC 2.6 %
(a)
Excludes short-term securities.
C000058059 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Global Dividend Portfolio
Class Name Investor C Shares
Trading Symbol BCBDX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BlackRock Global Dividend Portfolio (the “Fund”) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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.
Additional Information Phone Number (800) 441‑7762
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the last year?
(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 $191 1.83%
Expenses Paid, Amount $ 191
Expense Ratio, Percent 1.83%
Factors Affecting Performance [Text Block]
How did the Fund perform last year?
  • For the reporting period ended May 31, 2025, the Fund's Investor C Shares returned 8.46%.
  • For the same period, the Fund’s benchmark, the MSCI All Country World Index, returned 13.65%.
What contributed to performance?
In sector terms, leading contributors included stock selection in energy along with an overweight to, and stock selection within, materials. At the individual stock level, semiconductor company Broadcom Inc. had been a prime beneficiary of optimism around artificial intelligence (“AI”). Broadcom remains well-positioned as the market shifts toward application-specific chips, which are increasingly critical to improving AI model efficiency. Philip Morris International Inc. delivered strong results driven by the expansion of its smoke-free portfolio. The Fund exited the position due to rising competition in U.S. nicotine pouches and concerns that Philip Morris may need to cut prices to remain competitive. Shares of Spanish Bank BBVA rose notably since the start of 2025 as European financials have benefited from higher interest rates and plans for fiscal stimulus. In addition, BBVA posted earnings beats for both the fourth quarter of 2024 and first quarter of 2025, driven by its trading division.
What detracted from performance?
Stock selection in consumer discretionary weighed on return, along with overweights to, and stock selection within, healthcare and consumer staples. At the individual stock level, Novo Nordisk A/S declined on disappointing trial data for CagriSema, its next generation weight loss drug, along with market share gains by competitor Eli Lilly. The Fund continued to hold the stock given CagriSema’s comparable efficacy to Eli Lilly’s incumbent drug and the expanding weight loss market. Shares of U.S. managed care company United Health Group Inc. declined late in the period, following downgraded guidance driven by higher-than-expected claims activity. The current valuation appeared compelling given structural tailwinds for Medicare Advantage broadly and potential levers available to the company to help improve profitability. U.S. semiconductor manufacturer Texas Instruments Inc. declined sharply following weak fourth quarter 2024 results driven by softness in the industrial and auto markets, which led to elevated inventories and lower revenue and net income. The Fund exited the position.
The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future results.
Line Graph [Table Text Block]
Fund performance
Cumulative performance: June 1, 2015 through May 31, 2025
Initial investment of $10,000
Fund Performance - Growth of 10K
See “Average annual total returns” for additional information on fund performance.
Average Annual Return [Table Text Block]
Average annual total returns
1 Year 5 Years 10 Years
Investor C Shares 8.46 % 9.20 % 6.32 %
Investor C Shares (with sales charge) 7.46 9.20 6.32
MSCI All Country World Index 13.65 13.37 9.25
No Deduction of Taxes [Text Block] Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares.
Updated Performance Information Location [Text Block] Visit blackrock.com for more recent performance information.
Net Assets $ 1,009,586,312
Holdings Count | Holding 48
Advisory Fees Paid, Amount $ 6,627,287
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $1,009,586,312
Number of Portfolio Holdings 48
Net Investment Advisory Fees $6,627,287
Portfolio Turnover Rate 44%
Holdings [Text Block]
What did the Fund invest in?
(as of May 31, 2025)
Geographic allocation
Country Percent of
Net Assets
United States 66.4 %
United Kingdom 10.8 %
Taiwan 5.3 %
France 3.8 %
Denmark 2.5 %
Spain 2.2 %
Canada 2.1 %
Netherlands 2.0 %
Switzerland 2.0 %
Japan 1.5 %
Short-Term Securities 1.6 %
Liabilities in Excess of Other Assets (0.2 )%
Ten largest holdings
Security(a) Percent of
Net Assets
Microsoft Corp. 5.9 %
Taiwan Semiconductor Manufacturing Co. Ltd. 3.9 %
Broadcom, Inc. 3.8 %
AstraZeneca PLC 3.4 %
Coca-Cola Co. (The) 2.8 %
Meta Platforms, Inc., Class A 2.7 %
Accenture PLC, Class A 2.7 %
Walmart, Inc. 2.7 %
CMS Energy Corp. 2.6 %
RELX PLC 2.6 %
(a)
Excludes short-term securities.
Largest Holdings [Text Block]
Ten largest holdings
Security(a) Percent of
Net Assets
Microsoft Corp. 5.9 %
Taiwan Semiconductor Manufacturing Co. Ltd. 3.9 %
Broadcom, Inc. 3.8 %
AstraZeneca PLC 3.4 %
Coca-Cola Co. (The) 2.8 %
Meta Platforms, Inc., Class A 2.7 %
Accenture PLC, Class A 2.7 %
Walmart, Inc. 2.7 %
CMS Energy Corp. 2.6 %
RELX PLC 2.6 %
(a)
Excludes short-term securities.
C000058058 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Global Dividend Portfolio
Class Name Investor A Shares
Trading Symbol BABDX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BlackRock Global Dividend Portfolio (the “Fund”) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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.
Additional Information Phone Number (800) 441‑7762
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the last year?
(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 $108 1.03%
Expenses Paid, Amount $ 108
Expense Ratio, Percent 1.03%
Factors Affecting Performance [Text Block]
How did the Fund perform last year?
  • For the reporting period ended May 31, 2025, the Fund's Investor A Shares returned 9.31%.
  • For the same period, the Fund’s benchmark, the MSCI All Country World Index, returned 13.65%.
What contributed to performance?
In sector terms, leading contributors included stock selection in energy along with an overweight to, and stock selection within, materials. At the individual stock level, semiconductor company Broadcom Inc. had been a prime beneficiary of optimism around artificial intelligence (“AI”). Broadcom remains well-positioned as the market shifts toward application-specific chips, which are increasingly critical to improving AI model efficiency. Philip Morris International Inc. delivered strong results driven by the expansion of its smoke-free portfolio. The Fund exited the position due to rising competition in U.S. nicotine pouches and concerns that Philip Morris may need to cut prices to remain competitive. Shares of Spanish Bank BBVA rose notably since the start of 2025 as European financials have benefited from higher interest rates and plans for fiscal stimulus. In addition, BBVA posted earnings beats for both the fourth quarter of 2024 and first quarter of 2025, driven by its trading division.
What detracted from performance?
Stock selection in consumer discretionary weighed on return, along with overweights to, and stock selection within, healthcare and consumer staples. At the individual stock level, Novo Nordisk A/S declined on disappointing trial data for CagriSema, its next generation weight loss drug, along with market share gains by competitor Eli Lilly. The Fund continued to hold the stock given CagriSema’s comparable efficacy to Eli Lilly’s incumbent drug and the expanding weight loss market. Shares of U.S. managed care company United Health Group Inc. declined late in the period, following downgraded guidance driven by higher-than-expected claims activity. The current valuation appeared compelling given structural tailwinds for Medicare Advantage broadly and potential levers available to the company to help improve profitability. U.S. semiconductor manufacturer Texas Instruments Inc. declined sharply following weak fourth quarter 2024 results driven by softness in the industrial and auto markets, which led to elevated inventories and lower revenue and net income. The Fund exited the position.
The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future results.
Line Graph [Table Text Block]
Fund performance
Cumulative performance: June 1, 2015 through May 31, 2025
Initial investment of $10,000
Fund Performance - Growth of 10K
See “Average annual total returns” for additional information on fund performance.
Average Annual Return [Table Text Block]
Average annual total returns
1 Year 5 Years 10 Years
Investor A Shares 9.31 % 10.07 % 6.97 %
Investor A Shares (with sales charge) 3.57 8.89 6.39
MSCI All Country World Index 13.65 13.37 9.25
No Deduction of Taxes [Text Block] Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares.
Updated Performance Information Location [Text Block] Visit blackrock.com for more recent performance information.
Net Assets $ 1,009,586,312
Holdings Count | Holding 48
Advisory Fees Paid, Amount $ 6,627,287
Investment Company Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $1,009,586,312
Number of Portfolio Holdings 48
Net Investment Advisory Fees $6,627,287
Portfolio Turnover Rate 44%
Holdings [Text Block]
What did the Fund invest in?
(as of May 31, 2025)
Geographic allocation
Country Percent of
Net Assets
United States 66.4 %
United Kingdom 10.8 %
Taiwan 5.3 %
France 3.8 %
Denmark 2.5 %
Spain 2.2 %
Canada 2.1 %
Netherlands 2.0 %
Switzerland 2.0 %
Japan 1.5 %
Short-Term Securities 1.6 %
Liabilities in Excess of Other Assets (0.2 )%
Ten largest holdings
Security(a) Percent of
Net Assets
Microsoft Corp. 5.9 %
Taiwan Semiconductor Manufacturing Co. Ltd. 3.9 %
Broadcom, Inc. 3.8 %
AstraZeneca PLC 3.4 %
Coca-Cola Co. (The) 2.8 %
Meta Platforms, Inc., Class A 2.7 %
Accenture PLC, Class A 2.7 %
Walmart, Inc. 2.7 %
CMS Energy Corp. 2.6 %
RELX PLC 2.6 %
(a)
Excludes short-term securities.
Largest Holdings [Text Block]
Ten largest holdings
Security(a) Percent of
Net Assets
Microsoft Corp. 5.9 %
Taiwan Semiconductor Manufacturing Co. Ltd. 3.9 %
Broadcom, Inc. 3.8 %
AstraZeneca PLC 3.4 %
Coca-Cola Co. (The) 2.8 %
Meta Platforms, Inc., Class A 2.7 %
Accenture PLC, Class A 2.7 %
Walmart, Inc. 2.7 %
CMS Energy Corp. 2.6 %
RELX PLC 2.6 %
(a)
Excludes short-term securities.