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Other Assets - Amortization of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule Of Intangible Assets And Goodwill [Line Items]        
Amortization $ 20 $ 95 $ 63 $ 154
Platform Solutions        
Schedule Of Intangible Assets And Goodwill [Line Items]        
Finite-Lived Intangible Assets, Period Increase (Decrease)   $ 72