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Allowance for Loan Losses - Loans Modified Accounts for TDR (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Receivables [Abstract]        
Modified loans $ 68 $ 40 $ 186 $ 109
Charge-offs 101 37 217 90
Payment-default $ 13 $ 6 $ 31 $ 15