v3.26.1
Card Balances and Other Loans - Modifications Subsequently Defaulted (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default $ 80 $ 83 $ 109 $ 114
Interest Rate Reduction and Term Extension        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 2 2 2 2
Interest Rate Reduction        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 64 66 89 91
Term Extension        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 14 15 18 21
Card Balances | Consumer        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 46 50 63 68
Card Balances | Small Business        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 31 30 42 43
Card Balances | Corporate        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 1 1 1 1
Card Balances | Interest Rate Reduction and Term Extension | Consumer        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 0 0 0 0
Card Balances | Interest Rate Reduction and Term Extension | Small Business        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 0 0 0 0
Card Balances | Interest Rate Reduction and Term Extension | Corporate        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 0 0 0 0
Card Balances | Interest Rate Reduction | Consumer        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 42 45 58 62
Card Balances | Interest Rate Reduction | Small Business        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 22 21 30 29
Card Balances | Interest Rate Reduction | Corporate        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 0 0 0 0
Card Balances | Term Extension | Consumer        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 4 5 5 6
Card Balances | Term Extension | Small Business        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 9 9 12 14
Card Balances | Term Extension | Corporate        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 1 1 1 1
Other Loans        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 2 2 2 2
Other Loans | Interest Rate Reduction and Term Extension        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 2 2 2 2
Other Loans | Interest Rate Reduction        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default 0 0 0 0
Other Loans | Term Extension        
Financing Receivable, Modifications [Line Items]        
Account balance, modified and subsequent default $ 0 $ 0 $ 0 $ 0