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Significant Credit Concentrations (Details Textual) - USD ($) $ in Billions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Card Members, Member Loans And Other Loans |  |
Concentration Risk [Line Items] |  |
Unused lines-of-credit | $ 350 |
Card Members, Member Loans |  |
Concentration Risk [Line Items] |  |
Unused lines-of-credit |  | $ 327
Geographic | Card Members, Member Loans And Other Loans | United States |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 80.00% |
Geographic | Card Members, Member Loans | United States |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage |  | 80.00%

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