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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount |  |  | $ 2,100 |
Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | $ 318 | $ 315 | 915 | $ 1,084
Interest rate reduction | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 186 | 73 | 548 | 235
Term extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 5 | 104 | 33 | 235
Interest rate reduction and term extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 112 | 110 | 288 | 331
Other Modifications | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 15 | 28 | 46 | 283
Credit Card: | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 204 | 73 | 598 | 237
Credit Card: | Entity Loan Modification Program | Personal loans |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 16 |  | 47 |
Credit Card: | Interest rate reduction | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 186 | 73 | 548 | 235
Credit Card: | Interest rate reduction | Entity Loan Modification Program | Personal loans |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 0 |
Credit Card: | Term extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 3 | 0 | 7 | 0
Credit Card: | Term extension | Entity Loan Modification Program | Personal loans |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 3 |  | 7 |
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 4 | 0 | 10 | 2
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program | Personal loans |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 2 |  | 7 |
Credit Card: | Other Modifications | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 11 | 0 | 33 | 0
Credit Card: | Other Modifications | Entity Loan Modification Program | Personal loans |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 11 |  | 33 |
Credit Card: | Domestic credit card: | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 165 | 52 | 484 | 181
Credit Card: | Domestic credit card: | Interest rate reduction | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 163 | 52 | 481 | 179
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: | Interest rate reduction and term extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 2 | 0 | 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 | 23 | 21 | 67 | 56
Credit Card: | International card businesses: | Interest rate reduction | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 23 | 21 | 67 | 56
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: | 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 | 110 | 111 | 284 | 336
Consumer Banking: | Entity Loan Modification Program | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 110 | 111 | 284 | 335
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 | 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
Consumer Banking: | Term extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 2 | 1 | 6 | 7
Consumer Banking: | Term extension | Entity Loan Modification Program | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 2 | 1 | 6 | 6
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 | 108 | 110 | 278 | 329
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 108 | 110 | 278 | 329
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 | 0 | 0 | 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
Commercial Banking: | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 4 | 131 | 33 | 511
Commercial Banking: | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 4 | 131 | 11 | 131
Commercial Banking: | Entity Loan Modification Program | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount |  | 0 | 22 | 380
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
Commercial Banking: | Term extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 103 | 20 | 228
Commercial Banking: | Term extension | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 103 | 0 | 103
Commercial Banking: | Term extension | Entity Loan Modification Program | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount |  | 0 | 20 | 125
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
Commercial Banking: | Other Modifications | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 4 | 28 | 13 | 283
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | $ 4 | 28 | 11 | 28
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount |  | $ 0 | $ 2 | $ 255

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