v3.26.1
Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount $ 315  
Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 355 $ 149
Interest rate reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 186 58
Term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 5 1
Principal balance reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 5  
Interest rate reduction and term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 146 86
Other Modifications | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 13 4
Credit Card: | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 204 59
Credit Card: | Entity Loan Modification Program | Personal loans    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 17  
Credit Card: | Interest rate reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 186 58
Credit Card: | Interest rate reduction | Entity Loan Modification Program | Personal loans    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Credit Card: | Term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 2 0
Credit Card: | Term extension | Entity Loan Modification Program | Personal loans    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 2  
Credit Card: | Principal balance reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Credit Card: | Principal balance reduction | Entity Loan Modification Program | Personal loans    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 4 1
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program | Personal loans    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 3  
Credit Card: | Other Modifications | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 12 0
Credit Card: | Other Modifications | Entity Loan Modification Program | Personal loans    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 12  
Credit Card: | Domestic credit card: | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 163 38
Credit Card: | Domestic credit card: | Interest rate reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 162 37
Credit Card: | Domestic credit card: | Term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Credit Card: | Domestic credit card: | Principal balance reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Credit Card: | Domestic credit card: | Interest rate reduction and term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 1 1
Credit Card: | Domestic credit card: | Other Modifications | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Credit Card: | International card businesses: | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 24 21
Credit Card: | International card businesses: | Interest rate reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 24 21
Credit Card: | International card businesses: | Term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Credit Card: | International card businesses: | Principal balance reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 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
Credit Card: | International card businesses: | Other Modifications | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Consumer Banking: | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 146 86
Consumer Banking: | Entity Loan Modification Program | Auto    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 145 86
Consumer Banking: | Entity Loan Modification Program | Retail banking    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 1  
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program | Auto    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program | Retail banking    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Consumer Banking: | Term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 3 1
Consumer Banking: | Term extension | Entity Loan Modification Program | Auto    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 3 1
Consumer Banking: | Term extension | Entity Loan Modification Program | Retail banking    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Consumer Banking: | Principal balance reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Consumer Banking: | Principal balance reduction | Entity Loan Modification Program | Auto    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Consumer Banking: | Principal balance reduction | Entity Loan Modification Program | Retail banking    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 142 85
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Auto    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 142 85
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Retail banking    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Consumer Banking: | Other Modifications | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 1 0
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Auto    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Retail banking    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 1  
Commercial Banking: | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 5 4
Commercial Banking: | Entity Loan Modification Program | Commercial and multifamily real estate    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 4
Commercial Banking: | Entity Loan Modification Program | Commercial and industrial    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 5 0
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 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
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program | Commercial and industrial    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Commercial Banking: | Term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Commercial Banking: | Term extension | Entity Loan Modification Program | Commercial and multifamily real estate    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Commercial Banking: | Term extension | Entity Loan Modification Program | Commercial and industrial    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 0
Commercial Banking: | Principal balance reduction | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 5  
Commercial Banking: | Principal balance reduction | Entity Loan Modification Program | Commercial and multifamily real estate    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0  
Commercial Banking: | Principal balance reduction | Entity Loan Modification Program | Commercial and industrial    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 5  
Commercial Banking: | Interest rate reduction and term extension | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 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
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
Commercial Banking: | Other Modifications | Entity Loan Modification Program    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 4
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and multifamily real estate    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount 0 4
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and industrial    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Amount $ 0 $ 0