v3.26.1
Investor A C Institutional and Class R [Member] Expense Example - Investor A, C, Institutional and Class R - BlackRock LifePath Dynamic 2045 Fund
Dec. 31, 2025
USD ($)
Investor A Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 606
Expense Example, with Redemption, 3 Years 824
Expense Example, with Redemption, 5 Years 1,059
Expense Example, with Redemption, 10 Years 1,732
Investor C Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 262
Expense Example, with Redemption, 3 Years 548
Expense Example, with Redemption, 5 Years 960
Expense Example, with Redemption, 10 Years 1,911
Institutional Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 60
Expense Example, with Redemption, 3 Years 237
Expense Example, with Redemption, 5 Years 428
Expense Example, with Redemption, 10 Years 981
Class R Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 106
Expense Example, with Redemption, 3 Years 378
Expense Example, with Redemption, 5 Years 671
Expense Example, with Redemption, 10 Years $ 1,503