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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | $ 3,100 |  |  |
Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 337 | $ 504 | $ 679 | $ 769
Interest rate reduction | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 213 | 71 | 451 | 162
Term Extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 23 | 61 | 25 | 131
Interest rate reduction and term extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 90 | 117 | 180 | 221
Other Modifications | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 11 | 255 | 23 | 255
Credit Card: | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 224 | 72 | 476 | 164
Credit Card: | Entity Loan Modification Program | Personal loans |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 10 |  | 23 |
Credit Card: | Interest rate reduction | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 213 | 71 | 451 | 162
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 | 1 | 0 | 2 | 0
Credit Card: | Term Extension | Entity Loan Modification Program | Personal loans |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 1 |  | 2 |
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 4 | 1 | 9 | 2
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program | Personal loans |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 3 |  | 7 |
Credit Card: | Other Modifications | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 6 | 0 | 14 | 0
Credit Card: | Other Modifications | Entity Loan Modification Program | Personal loans |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 6 |  | 14 |
Credit Card: | Domestic credit card: | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 191 | 54 | 408 | 129
Credit Card: | Domestic credit card: | Interest rate reduction | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 190 | 53 | 406 | 127
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 | 1 | 1 | 2 | 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 | 18 | 45 | 35
Credit Card: | International card businesses: | Interest rate reduction | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 23 | 18 | 45 | 35
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 | 88 | 119 | 174 | 225
Consumer Banking: | Entity Loan Modification Program | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 88 | 118 | 174 | 224
Consumer Banking: | Entity Loan Modification Program | Retail banking |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 1 |  | 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 | 0 |  | 0
Consumer Banking: | Term Extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 2 | 3 | 3 | 6
Consumer Banking: | Term Extension | Entity Loan Modification Program | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 2 | 2 | 3 | 5
Consumer Banking: | Term Extension | Entity Loan Modification Program | Retail banking |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 1 |  | 1
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 86 | 116 | 171 | 219
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 86 | 116 | 171 | 219
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Retail banking |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 |  | 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 | 0 |  | 0
Commercial Banking: | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 25 | 313 | 29 | 380
Commercial Banking: | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 2 | 0 | 7 | 0
Commercial Banking: | Entity Loan Modification Program | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 23 | 313 | 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 | 0
Commercial Banking: | Term Extension | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 20 | 58 | 20 | 125
Commercial Banking: | 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: | Term Extension | Entity Loan Modification Program | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 20 | 58 | 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 | 0
Commercial Banking: | Other Modifications | Entity Loan Modification Program |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 5 | 255 | 9 | 255
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 2 | 0 | 7 | 0
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | $ 3 | $ 255 | $ 2 | $ 255

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