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Allowance for Credit Losses and Reserve for Unfunded Lending Commitments - Summary of Loss Sharing Arrangements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Provision for credit losses $ 10,264 $ 6,236 $ 5,856
Loss sharing agreements      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Expected reimbursement from loss sharing partners, beginning balance 1,162 379 380
Amounts due from partners which reduced net charge-offs (959) (600) (382)
Provision for credit losses 952 1,383 381
Expected reimbursement from loss sharing partners, ending balance 2,159 1,162 $ 379
Loss sharing agreements | Including CECL Impact Adoption      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Expected reimbursement from loss sharing partners, beginning balance $ 2,166    
Expected reimbursement from loss sharing partners, ending balance   $ 2,166