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 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Investor P | BLACKROCK LIFEPATH INDEX 2040 FUND | Investor P Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 17.33% | 12.31% | 18.21% | (17.91%) | 15.75% | 13.73% | 24.63% | (7.32%) | 19.60% | 7.78% |