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Summary of Significant Accounting Policies - Card Member Loans HFS (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 01, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Reversal of reserve for credit losses |  | $ (5,185) | $ (4,923) | $ (2,182)
Card Member loans |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Financing receivables held for sale | $ 758 | 758 | 0 |
Reversal of reserve for credit losses | $ 49 | $ (4,109) | $ (3,839) | $ (1,514)

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