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Other Assets - Schedule of Other Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Accrued interest receivable $ 1,661 $ 1,733
Benefit and insurance-related investments 460 459
Income tax asset, net 100 120
Derivatives at fair value 47 25
Accounts receivable 19 49
Fixed assets 28 52
Other 111 100
Total $ 2,426 $ 2,538