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Loans and Card Member Receivables - Modifications that Subsequently Defaulted (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | $ 97 | $ 120 | $ 239
Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 1 |  |
Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 73 |  |
Term Extension |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 23 |  |
Card Member loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default |  | 81 | 174
Card Member loans | Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 53 |  |
Card Member loans | Small Business |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 20 |  |
Card Member loans | Corporate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Card Member loans | Interest Rate Reduction and Term Extension | Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Card Member loans | Interest Rate Reduction and Term Extension | Small Business |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Card Member loans | Interest Rate Reduction and Term Extension | Corporate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Card Member loans | Interest Rate Reduction | Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 53 |  |
Card Member loans | Interest Rate Reduction | Small Business |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 20 |  |
Card Member loans | Interest Rate Reduction | Corporate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Card Member receivables |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default |  | 38 | 56
Card Member receivables | Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 9 |  |
Card Member receivables | Small Business |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 14 |  |
Card Member receivables | Corporate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Card Member receivables | Interest Rate Reduction and Term Extension | Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Card Member receivables | Interest Rate Reduction and Term Extension | Small Business |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Card Member receivables | Interest Rate Reduction and Term Extension | Corporate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Card Member receivables | Term Extension | Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 9 |  |
Card Member receivables | Term Extension | Small Business |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 14 |  |
Card Member receivables | Term Extension | Corporate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Other loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 1 | $ 1 | $ 9
Other loans | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 1 |  |
Other loans | Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | 0 |  |
Other loans | Term Extension |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Account balance, modified and subsequent default | $ 0 |  |

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