Investor A C Institutional and Class R [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 A, C, Institutional and Class R | BlackRock LifePath Dynamic 2045 Fund | Institutional Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 18.47% | 15.51% | 20.98% | (17.68%) | 17.61% | 14.31% | 26.38% | (8.18%) | 22.29% | 8.14% |