v3.26.1
Card Balances and Other Loans - Modifications Subsequently Defaulted (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default $ 89 $ 84
Interest Rate Reduction and Term Extension    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 2 1
Interest Rate Reduction    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 71 67
Term Extension    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 16 16
Card Balances | Consumer    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 50 50
Card Balances | Small Business    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 36 33
Card Balances | Corporate    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 1 0
Card Balances | Interest Rate Reduction and Term Extension | Consumer    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 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
Card Balances | Interest Rate Reduction and Term Extension | Corporate    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 0 0
Card Balances | Interest Rate Reduction | Consumer    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 46 45
Card Balances | Interest Rate Reduction | Small Business    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 25 22
Card Balances | Interest Rate Reduction | Corporate    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 0 0
Card Balances | Term Extension | Consumer    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 5 5
Card Balances | Term Extension | Small Business    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 11 11
Card Balances | Term Extension | Corporate    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 1 0
Other Loans    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 2 1
Other Loans | Interest Rate Reduction and Term Extension    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 2 1
Other Loans | Interest Rate Reduction    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default 0 0
Other Loans | Term Extension    
Financing Receivable, Modifications [Line Items]    
Account balance, modified and subsequent default $ 0 $ 0