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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - Entity Loan Modification Program - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | $ 504 | $ 95 | $ 769
Interest rate reduction |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 71 | 41 | 162
Term Extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 61 | 3 | 131
Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 117 | 51 | 221
Other Modifications |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 255 |  | 255
Credit Card: |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 72 | 41 | 164
Credit Card: | Interest rate reduction |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 71 | 41 | 162
Credit Card: | Term Extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 | 0 | 0
Credit Card: | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 1 | 0 | 2
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 | 54 | 37 | 129
Credit Card: | Domestic credit card: | Interest rate reduction |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 53 | 37 | 127
Credit Card: | Domestic credit card: | Term Extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 | 0 | 0
Credit Card: | Domestic credit card: | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 1 | 0 | 2
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 | 18 | 4 | 35
Credit Card: | International card businesses: | Interest rate reduction |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 18 | 4 | 35
Credit Card: | International card businesses: | Term Extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 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
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 | 119 | 54 | 225
Consumer Banking: | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 118 | 54 | 224
Consumer Banking: | Retail banking |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 1 |  | 1
Consumer Banking: | Interest rate reduction |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 | 0 | 0
Consumer Banking: | Interest rate reduction | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 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 | 3 | 3 | 6
Consumer Banking: | Term Extension | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 2 | 3 | 5
Consumer Banking: | Term Extension | Retail banking |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 1 |  | 1
Consumer Banking: | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 116 | 51 | 219
Consumer Banking: | Interest Rate Reduction and Term Extension | Auto |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 116 | $ 51 | 219
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 | 313 |  | 380
Commercial Banking: | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  | 0
Commercial Banking: | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 313 |  | 380
Commercial Banking: | Interest rate reduction |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  | 0
Commercial Banking: | Interest rate reduction | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  | 0
Commercial Banking: | Interest rate reduction | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  | 0
Commercial Banking: | Term Extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 58 |  | 125
Commercial Banking: | Term Extension | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  | 0
Commercial Banking: | Term Extension | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 58 |  | 125
Commercial Banking: | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 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
Commercial Banking: | Interest Rate Reduction and Term Extension | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  | 0
Commercial Banking: | Other Modifications |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 255 |  | 255
Commercial Banking: | Other Modifications | Commercial and multifamily real estate |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | 0 |  | 0
Commercial Banking: | Other Modifications | Commercial and industrial |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Amount | $ 255 |  | $ 255

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