v3.26.1
Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount   $ 432   $ 1,400
Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount $ 387 337 $ 742 679
Interest rate reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 176 213 362 451
Term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 6 23 11 25
Principal balance reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   5  
Interest rate reduction and term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 194 90 340 180
Other Modifications | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 11 11 24 23
Credit Card: | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 195 224 399 476
Credit Card: | Entity Loan Modification Program | Personal loans        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 17 10 34 23
Credit Card: | Interest rate reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 176 213 362 451
Credit Card: | Interest rate reduction | Entity Loan Modification Program | Personal loans        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Credit Card: | Term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 3 1 5 2
Credit Card: | Term extension | Entity Loan Modification Program | Personal loans        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 3 1 5 2
Credit Card: | Principal balance reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   0  
Credit Card: | Principal balance reduction | Entity Loan Modification Program | Personal loans        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   0  
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 5 4 9 9
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program | Personal loans        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 3 3 6 7
Credit Card: | Other Modifications | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 11 6 23 14
Credit Card: | Other Modifications | Entity Loan Modification Program | Personal loans        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 11 6 23 14
Credit Card: | Domestic credit card: | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 152 191 315 408
Credit Card: | Domestic credit card: | Interest rate reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 150 190 312 406
Credit Card: | Domestic credit card: | Term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Credit Card: | Domestic credit card: | Principal balance reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   0  
Credit Card: | Domestic credit card: | Interest rate reduction and term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 2 1 3 2
Credit Card: | Domestic credit card: | Other Modifications | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Credit Card: | International card businesses: | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 26 23 50 45
Credit Card: | International card businesses: | Interest rate reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 26 23 50 45
Credit Card: | International card businesses: | Term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Credit Card: | International card businesses: | Principal balance reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   0  
Credit Card: | International card businesses: | Interest rate reduction and term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Credit Card: | International card businesses: | Other Modifications | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Consumer Banking: | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 192 88 338 174
Consumer Banking: | Entity Loan Modification Program | Auto        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 192 88 337 174
Consumer Banking: | Entity Loan Modification Program | Retail banking        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 1 0
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program | Auto        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program | Retail banking        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Consumer Banking: | Term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 3 2 6 3
Consumer Banking: | Term extension | Entity Loan Modification Program | Auto        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 3 2 6 3
Consumer Banking: | Term extension | Entity Loan Modification Program | Retail banking        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Consumer Banking: | Principal balance reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   0  
Consumer Banking: | Principal balance reduction | Entity Loan Modification Program | Auto        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   0  
Consumer Banking: | Principal balance reduction | Entity Loan Modification Program | Retail banking        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   0  
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 189 86 331 171
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Auto        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 189 86 331 171
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Retail banking        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Consumer Banking: | Other Modifications | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 1 0
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Auto        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Retail banking        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 1 0
Commercial Banking: | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 25 5 29
Commercial Banking: | Entity Loan Modification Program | Commercial and multifamily real estate        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 2 0 7
Commercial Banking: | Entity Loan Modification Program | Commercial and industrial        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 23 5 22
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program | Commercial and multifamily real estate        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program | Commercial and industrial        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Commercial Banking: | Term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 20 0 20
Commercial Banking: | Term extension | Entity Loan Modification Program | Commercial and multifamily real estate        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Commercial Banking: | Term extension | Entity Loan Modification Program | Commercial and industrial        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 20 0 20
Commercial Banking: | Principal balance reduction | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   5  
Commercial Banking: | Principal balance reduction | Entity Loan Modification Program | Commercial and multifamily real estate        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   0  
Commercial Banking: | Principal balance reduction | Entity Loan Modification Program | Commercial and industrial        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0   5  
Commercial Banking: | Interest rate reduction and term extension | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Commercial Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Commercial and multifamily real estate        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Commercial Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Commercial and industrial        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 0 0 0
Commercial Banking: | Other Modifications | Entity Loan Modification Program        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 5 0 9
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and multifamily real estate        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount 0 2 0 7
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and industrial        
Financing Receivable, Modified, Subsequent Default [Line Items]        
Amount $ 0 $ 3 $ 0 $ 2