Class K [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 |
|
| Class K | BlackRock LifePath Index 2060 Fund | Class K Shares | |||||||||
| Prospectus [Line Items] | |||||||||
| Annual Return [Percent] | 21.71% | 16.29% | 21.66% | (18.32%) | 18.80% | 15.06% | 26.92% | (7.84%) | 21.51% |