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Allowance for Credit Losses and Reserve for Unfunded Lending Commitments - Summary of Loss Sharing Arrangements (Detail) - Loss sharing agreements - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Expected reimbursement from loss sharing partners, beginning balance $ 2,166 $ 379
Amounts due from partners which reduced net charge-offs (302) (108)
Amounts estimated to be charged to partners which reduced provision for credit losses 789 171
Expected reimbursement from loss sharing partners, ending balance $ 2,653 $ 442