Investor A, Institutional [Member] Annual Total Returns |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Investor A, Institutional | BlackRock LifePath Index 2065 Fund | Investor A Shares | ||||||
| Prospectus [Line Items] | ||||||
| Annual Return [Percent] | 21.36% | 15.97% | 21.33% | (18.56%) | 18.48% | 15.14% |