Investor A, Institutional [Member] Expense Example - Investor A, Institutional - BLACKROCK LIFEPATH INDEX RETIREMENT FUND |
Dec. 31, 2025
USD ($)
|
|---|---|
| Investor A | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 40 |
| Expense Example, with Redemption, 3 Years | 130 |
| Expense Example, with Redemption, 5 Years | 228 |
| Expense Example, with Redemption, 10 Years | 516 |
| Institutional Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 14 |
| Expense Example, with Redemption, 3 Years | 50 |
| Expense Example, with Redemption, 5 Years | 88 |
| Expense Example, with Redemption, 10 Years | $ 203 |