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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  | $ 523 | $ 428
Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | $ 457 |  |
Interest rate reduction | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 109 |  |
Term Extension | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 112 |  |
Interest Rate Reduction and Term Extension | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 236 |  |
Credit Card: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  | 154 | 122
Credit Card: | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 110 |  |
Credit Card: | Interest rate reduction | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 109 |  |
Credit Card: | Term Extension | Entity Loan Modification Program |  |  |
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 | 1 |  |
Credit Card: | Domestic credit card: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  | 75 | 35
Credit Card: | Domestic credit card: | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 90 |  |
Credit Card: | Domestic credit card: | Interest rate reduction | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 89 |  |
Credit Card: | Domestic credit card: | Term Extension | 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 |  |
Credit Card: | International card businesses: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  | 79 | 87
Credit Card: | International card businesses: | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 20 |  |
Credit Card: | International card businesses: | Interest rate reduction | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 20 |  |
Credit Card: | International card businesses: | Term Extension | 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 |  |
Consumer Banking: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  | 286 | 136
Consumer Banking: | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  | 285 | 136
Consumer Banking: | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 250 |  |
Consumer Banking: | Entity Loan Modification Program | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 250 |  |
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  |
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program | Auto |  |  |
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 | 15 |  |
Consumer Banking: | Term Extension | Entity Loan Modification Program | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 15 |  |
Consumer Banking: | Interest Rate Reduction and Term Extension | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 235 |  |
Consumer Banking: | Interest Rate Reduction and Term Extension | Entity Loan Modification Program | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 235 |  |
Commercial Banking: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  | 83 | 170
Commercial Banking: | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  | 27 | 50
Commercial Banking: | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  | $ 56 | $ 120
Commercial Banking: | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 97 |  |
Commercial Banking: | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 46 |  |
Commercial Banking: | Entity Loan Modification Program | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 51 |  |
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  |
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  |
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  |
Commercial Banking: | Term Extension | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 97 |  |
Commercial Banking: | Term Extension | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 46 |  |
Commercial Banking: | Term Extension | Entity Loan Modification Program | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 51 |  |
Commercial Banking: | Interest Rate Reduction and Term Extension | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 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 |  |
Commercial Banking: | Interest Rate Reduction and Term Extension | Entity Loan Modification Program | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | $ 0 |  |

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