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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - Entity Loan Modification Program - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | $ 315 | $ 204 | $ 1,084 | $ 283
Interest rate reduction |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 73 | 23 | 235 | 48
Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 104 | 104 | 235 | 106
Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 110 | 77 | 331 | 129
Other Modifications |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 28 |  | 283 |
Credit Card: |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 73 | 23 | 237 | 48
Credit Card: | Interest rate reduction |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 73 | 23 | 235 | 48
Credit Card: | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 0 | 0
Credit Card: | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 2 | 0
Credit Card: | Other Modifications |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 0 |
Credit Card: | Domestic credit card: |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 52 | 17 | 181 | 39
Credit Card: | Domestic credit card: | Interest rate reduction |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 52 | 17 | 179 | 39
Credit Card: | Domestic credit card: | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 0 | 0
Credit Card: | Domestic credit card: | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 2 | 0
Credit Card: | Domestic credit card: | Other Modifications |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 0 |
Credit Card: | International card businesses: |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 21 | 6 | 56 | 9
Credit Card: | International card businesses: | Interest rate reduction |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 21 | 6 | 56 | 9
Credit Card: | International card businesses: | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 0 | 0
Credit Card: | International card businesses: | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 0 | 0
Credit Card: | International card businesses: | Other Modifications |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 0 |
Consumer Banking: |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 111 | 84 | 336 | 138
Consumer Banking: | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 111 | 84 | 335 | 138
Consumer Banking: | Retail banking |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 1 |
Consumer Banking: | Interest rate reduction |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 0 | 0
Consumer Banking: | Interest rate reduction | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 0 | 0
Consumer Banking: | Interest rate reduction | Retail banking |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 0 |
Consumer Banking: | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 1 | 7 | 7 | 9
Consumer Banking: | Term Extension | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 1 | 7 | 6 | 9
Consumer Banking: | Term Extension | Retail banking |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 1 |
Consumer Banking: | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 110 | 77 | 329 | 129
Consumer Banking: | Interest Rate Reduction and Term Extension | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 110 | 77 | 329 | 129
Consumer Banking: | Interest Rate Reduction and Term Extension | Retail banking |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 0 |
Consumer Banking: | Other Modifications |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 0 |
Consumer Banking: | Other Modifications | Auto |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 0 |
Consumer Banking: | Other Modifications | Retail banking |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 0 |
Commercial Banking: |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 131 |  | 511 |
Commercial Banking: | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 131 |  | 131 |
Commercial Banking: | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 |  | 380 |
Commercial Banking: | Interest rate reduction |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 0 | 0
Commercial Banking: | Interest rate reduction | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 0 | 0
Commercial Banking: | Interest rate reduction | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 0 | 0
Commercial Banking: | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 103 | 97 | 228 | 97
Commercial Banking: | Term Extension | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 103 | 46 | 103 | 46
Commercial Banking: | Term Extension | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 51 | 125 | 51
Commercial Banking: | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 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 | 0 | 0
Commercial Banking: | Interest Rate Reduction and Term Extension | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 0 | 0 | 0 | 0
Commercial Banking: | Other Modifications |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 28 | 97 | 283 | 97
Commercial Banking: | Other Modifications | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | 28 | 46 | 28 | 46
Commercial Banking: | Other Modifications | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amount | $ 0 | $ 51 | $ 255 | $ 51

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