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Loans - Credit Card Loan Portfolio, Other Credit Quality Indicators (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans $ 1,299,590 $ 1,280,870 $ 1,089,598
Credit card      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans $ 232,860 $ 211,123  
Percentage of portfolio based on carrying value with estimated refreshed FICO scores, Equal to or greater than 660 85.50% 85.80%  
Percentage of portfolio based on carrying value with estimated refreshed FICO scores, Less than 660 14.30% 14.00%  
Percentage of portfolio based on carrying value with estimated refreshed FICO scores, No FICO available 0.20% 0.20%  
Credit card | California      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans $ 36,385 $ 32,652  
Credit card | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans 24,423 22,086  
Credit card | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans 18,525 16,915  
Credit card | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans 17,236 15,103  
Credit card | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans 12,442 11,364  
Credit card | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans 9,644 8,688  
Credit card | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans 6,976 6,424  
Credit card | Colorado      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans 6,962 6,307  
Credit card | Pennsylvania      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans 6,558 6,088  
Credit card | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans 5,796 5,209  
Credit card | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Retained loans $ 87,913 $ 80,287