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 |
|
| Class K | BlackRock LifePath Index 2065 Fund | Class K Shares | ||||||
| Prospectus [Line Items] | ||||||
| Annual Return [Percent] | 21.72% | 16.34% | 21.62% | (18.32%) | 18.87% | 15.47% |