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Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 47,664 $ 39,500 $ 37,876
Foreign currency translation adjustments [1] 606 (338) 261
Balance Ending 56,115 47,664 39,500
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (1,178) (840) (1,101)
Foreign currency translation adjustments [2] 606 (338) 261
Change in BlackRock, Inc.'s ownership interest 27 0 0
Balance Ending $ (545) $ (1,178) $ (840)
[1] Amount for 2025 includes a loss from a net investment hedge of $96 million (net of tax benefit of $30 million). Amount for 2024 includes a gain from a net investment hedge of $37 million (net of tax expense of $12 million). Amount for 2023 includes a loss from a net investment hedge of $20 million (net of tax benefit of $6 million).
[2] Amount for 2025 includes a loss from a net investment hedge of $96 million (net of tax benefit of $30 million). Amount for 2024 includes a gain from a net investment hedge of $37 million (net of tax expense of $12 million). Amount for 2023 includes a loss from a net investment hedge of $20 million (net of tax benefit of $6 million).