v3.25.2
Expense Example - BlackRock U.S. Mortgage Portfolio
Apr. 30, 2025
USD ($)
Investor A Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 469
Expense Example, with Redemption, 3 Years 644
Expense Example, with Redemption, 5 Years 834
Expense Example, with Redemption, 10 Years 1,383
Investor C Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 248
Expense Example, with Redemption, 3 Years 492
Expense Example, with Redemption, 5 Years 861
Expense Example, with Redemption, 10 Years 1,691
Institutional Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 166
Expense Example, with Redemption, 5 Years 297
Expense Example, with Redemption, 10 Years $ 680