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Loans and Card Member Receivables - TDR Subsequently Defaulted, Prior to Adoption (Details) account in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) account
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account |  |  | 18
Aggregated Outstanding Balances Upon Default | $ | $ 157 | $ 97 | $ 120
Card Member loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account |  |  | 14
Aggregated Outstanding Balances Upon Default | $ |  |  | $ 81
Card Member receivables |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account |  |  | 3
Aggregated Outstanding Balances Upon Default | $ |  |  | $ 38
Other Loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account |  |  | 1
Aggregated Outstanding Balances Upon Default | $ | $ 2 | $ 1 | $ 1

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