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Allowance for Credit Losses and Reserve for Unfunded Lending Commitments - Summary of Loss Sharing Arrangements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Change in estimated partner reimbursements that decreased/(increased) provision for credit losses $ 2,284 $ 1,669 $ 7,569 $ 3,431
Loss sharing agreements        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Expected reimbursement from loss sharing partners, beginning balance 1,908 1,302 1,558 1,450
Financing Receivable, Allowance for Credit Loss, Writeoff (249) (127) (681) (353)
Change in estimated partner reimbursements that decreased/(increased) provision for credit losses 319 237 1,101 315
Expected reimbursement from loss sharing partners, ending balance $ 1,978 $ 1,412 $ 1,978 $ 1,412