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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  |  | $ 523
Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | $ 1,367 | $ 457 |
Interest rate reduction | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 304 | 109 |
Term Extension | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 303 | 112 |
Interest Rate Reduction and Term Extension | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 451 | 236 |
Other Modifications | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 309 |  |
Credit Card: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  |  | 154
Credit Card: | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 307 | 110 |
Credit Card: | Interest rate reduction | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 304 | 109 |
Credit Card: | Term Extension | Entity Loan Modification Program |  |  |
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 | 3 | 1 |
Credit Card: | Other Modifications | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  |
Credit Card: | Domestic credit card: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  |  | 75
Credit Card: | Domestic credit card: | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 231 | 90 |
Credit Card: | Domestic credit card: | Interest rate reduction | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 228 | 89 |
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: | Interest Rate Reduction and Term Extension | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 3 | 1 |
Credit Card: | Domestic credit card: | Other Modifications | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  |
Credit Card: | International card businesses: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  |  | 79
Credit Card: | International card businesses: | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 76 | 20 |
Credit Card: | International card businesses: | Interest rate reduction | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 76 | 20 |
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: | 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 |  |
Consumer Banking: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  |  | 286
Consumer Banking: | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  |  | 285
Consumer Banking: | Retail banking |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  |  | 1
Consumer Banking: | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 457 | 250 |
Consumer Banking: | Entity Loan Modification Program | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 456 | 250 |
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 | 9 | 15 |
Consumer Banking: | Term Extension | Entity Loan Modification Program | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 8 | 15 |
Consumer Banking: | Term Extension | Entity Loan Modification Program | Retail banking |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 1 |  |
Consumer Banking: | Interest Rate Reduction and Term Extension | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 448 | 235 |
Consumer Banking: | Interest Rate Reduction and Term Extension | Entity Loan Modification Program | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 448 | 235 |
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 | 0 |  |
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  |
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Retail banking |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  |
Commercial Banking: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  |  | 83
Commercial Banking: | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  |  | 27
Commercial Banking: | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount |  |  | $ 56
Commercial Banking: | Entity Loan Modification Program |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 603 |  |
Commercial Banking: | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 223 |  |
Commercial Banking: | Entity Loan Modification Program | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 380 |  |
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 | 294 | 97 |
Commercial Banking: | Term Extension | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 169 | 46 |
Commercial Banking: | Term Extension | Entity Loan Modification Program | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 125 | 51 |
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 | 309 | 97 |
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 54 | 46 |
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | $ 255 | $ 51 |

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