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Other Assets - Schedule of Other Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Accrued interest receivable $ 1,933 $ 1,881
Benefit and insurance-related investments 450 462
Income tax asset, net 145 369
Derivatives at fair value 56 218
Accounts receivable 91 159
Fixed assets 77 95
Other 35 39
Total $ 2,787 $ 3,223