Investor P [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 P | BlackRock LifePath Index 2065 Fund | Investor P Shares | ||||||
| Prospectus [Line Items] | ||||||
| Annual Return [Percent] | 21.33% | 16.01% | 21.21% | (18.51%) | 18.52% | 15.12% |