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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 12 Months Ended
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Change in estimated partner reimbursements that (increased) decreased provision for credit losses   $ 11,716 $ 10,426 $ 5,847
Domestic Credit Card Portfolio Segment        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance build (release) for credit losses $ 826      
Loss sharing agreements        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Estimated reimbursements from partners, beginning of period   2,014 1,558 1,450
Amounts due from partners for charged off loans   (904) (980) (515)
Change in estimated partner reimbursements that (increased) decreased provision for credit losses   (100) 1,436 623
Estimated reimbursements from partners, end of period   $ 1,010 $ 2,014 $ 1,558