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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Change in estimated partner reimbursements that (increased) decreased provision for credit losses $ 11,430 $ 3,909 $ 13,799 $ 6,592
Allowance build (release) for credit losses     7,600  
Loss sharing agreements        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Estimated reimbursements from partners, beginning of period 1,090 2,075 1,010 2,014
Amounts due from partners for charged off loans (166) (253) (337) (577)
Change in estimated partner reimbursements that (increased) decreased provision for credit losses 267 (612) 518 (227)
Estimated reimbursements from partners, end of period $ 1,191 $ 1,210 $ 1,191 $ 1,210