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Loans and Card Member Receivables - Modifications Subsequently Defaulted (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | $ 74 | $ 95 | $ 117 | $ 134
Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 1 | 2 | 2 | 2
Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 59 | 75 | 96 | 108
Term Extension |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 14 | 18 | 19 | 24
Card Member Loans | Consumer |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 40 | 52 | 65 | 75
Card Member Loans | Small Business |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 19 | 23 | 31 | 33
Card Member Loans | Corporate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Card Member Loans | Interest Rate Reduction and Term Extension | Consumer |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Card Member Loans | Interest Rate Reduction and Term Extension | Small Business |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Card Member Loans | Interest Rate Reduction and Term Extension | Corporate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Card Member Loans | Interest Rate Reduction | Consumer |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 40 | 52 | 65 | 75
Card Member Loans | Interest Rate Reduction | Small Business |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 19 | 23 | 31 | 33
Card Member Loans | Interest Rate Reduction | Corporate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Card Member Receivables | Consumer |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 5 | 6 | 6 | 8
Card Member Receivables | Small Business |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 9 | 12 | 13 | 16
Card Member Receivables | Corporate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Card Member Receivables | Interest Rate Reduction and Term Extension | Consumer |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Card Member Receivables | Interest Rate Reduction and Term Extension | Small Business |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Card Member Receivables | Interest Rate Reduction and Term Extension | Corporate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Card Member Receivables | Term Extension | Consumer |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 5 | 6 | 6 | 8
Card Member Receivables | Term Extension | Small Business |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 9 | 12 | 13 | 16
Card Member Receivables | Term Extension | Corporate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Other Loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 1 | 2 | 2 | 2
Other Loans | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 1 | 2 | 2 | 2
Other Loans | Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | 0 | 0 | 0 | 0
Other Loans | Term Extension |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Account balance, modified and subsequent default | $ 0 | $ 0 | $ 0 | $ 0

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