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Loans and Card Member Receivables - Modifications Subsequently Defaulted (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | $ 95 | $ 0 | $ 134 | $ 0
Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 2 |  | 2 |
Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 75 |  | 108 |
Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 18 |  | 24 |
Card Member Loans | Consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 52 |  | 75 |
Card Member Loans | Small Business |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 23 |  | 33 |
Card Member Loans | Corporate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Card Member Loans | Interest Rate Reduction and Term Extension | Consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Card Member Loans | Interest Rate Reduction and Term Extension | Small Business |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Card Member Loans | Interest Rate Reduction and Term Extension | Corporate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Card Member Loans | Interest Rate Reduction | Consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 52 |  | 75 |
Card Member Loans | Interest Rate Reduction | Small Business |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 23 |  | 33 |
Card Member Loans | Interest Rate Reduction | Corporate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Card Member Receivables | Consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 6 |  | 8 |
Card Member Receivables | Small Business |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 12 |  | 16 |
Card Member Receivables | Corporate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Card Member Receivables | Interest Rate Reduction and Term Extension | Consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Card Member Receivables | Interest Rate Reduction and Term Extension | Small Business |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Card Member Receivables | Interest Rate Reduction and Term Extension | Corporate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Card Member Receivables | Term Extension | Consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 6 |  | 8 |
Card Member Receivables | Term Extension | Small Business |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 12 |  | 16 |
Card Member Receivables | Term Extension | Corporate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Other Loans |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 2 |  | 2 |
Other Loans | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 2 |  | 2 |
Other Loans | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | 0 |  | 0 |
Other Loans | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Account balance | $ 0 |  | $ 0 |

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