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Other Assets - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
iCapital [Member]    
Other Assets [Line Items]    
Carrying value - equity method investment $ 660 $ 641
Percentage of strategic minority investment 24.00% 24.00%
Other Assets [Member]    
Other Assets [Line Items]    
Carrying value - equity method investment $ 768 $ 773
Other non equity method corporate minority investments $ 596 $ 484