XML 112 R80.htm IDEA: XBRL DOCUMENT

Class K [Member] Annual Total Returns	12 Months Ended
Class K [Member] Annual Total Returns	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Class K \| BlackRock LifePath ESG Index 2050 Fund \| Class K
Prospectus [Line Items]
Annual Return [Percent]	20.21%	15.17%	20.89%	(18.54%)	19.83%