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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - Entity Loan Modification Program - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | $ 149 | $ 265
Interest rate reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 58 | 91
Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 1 | 70
Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 86 | 104
Other Modifications |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 4 |
Credit Card: |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 59 | 92
Credit Card: | Interest rate reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 58 | 91
Credit Card: | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Credit Card: | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 1 | 1
Credit Card: | Other Modifications |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 |
Credit Card: | Domestic credit card: |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 38 | 75
Credit Card: | Domestic credit card: | Interest rate reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 37 | 74
Credit Card: | Domestic credit card: | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Credit Card: | Domestic credit card: | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 1 | 1
Credit Card: | Domestic credit card: | Other Modifications |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 |
Credit Card: | International card businesses: |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 21 | 17
Credit Card: | International card businesses: | Interest rate reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 21 | 17
Credit Card: | International card businesses: | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Credit Card: | International card businesses: | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Credit Card: | International card businesses: | Other Modifications |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 |
Consumer Banking: |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 86 | 106
Consumer Banking: | Auto |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 86 | 106
Consumer Banking: | Interest rate reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Consumer Banking: | Interest rate reduction | Auto |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Consumer Banking: | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 1 | 3
Consumer Banking: | Term Extension | Auto |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 1 | 3
Consumer Banking: | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 85 | 103
Consumer Banking: | Interest Rate Reduction and Term Extension | Auto |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 85 | 103
Consumer Banking: | Other Modifications |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 |
Consumer Banking: | Other Modifications | Auto |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 |
Commercial Banking: |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 4 |
Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 4 |
Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 |
Commercial Banking: | Interest rate reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Commercial Banking: | Interest rate reduction | Commercial and multifamily real estate |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Commercial Banking: | Interest rate reduction | Commercial and industrial |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Commercial Banking: | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 67
Commercial Banking: | Term Extension | Commercial and multifamily real estate |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Commercial Banking: | Term Extension | Commercial and industrial |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 67
Commercial Banking: | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Commercial Banking: | Interest Rate Reduction and Term Extension | Commercial and multifamily real estate |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Commercial Banking: | Interest Rate Reduction and Term Extension | Commercial and industrial |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 0 | 0
Commercial Banking: | Other Modifications |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 4 | 67
Commercial Banking: | Other Modifications | Commercial and multifamily real estate |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | 4 | 0
Commercial Banking: | Other Modifications | Commercial and industrial |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amount | $ 0 | $ 67

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