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Loans and Card Member Receivables - Card Member and other Loans (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Card Member loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | $ 125,995 | $ 107,964 |  |
Financing receivables, reserves for credit losses | 5,118 | 3,747 | $ 3,305 | $ 5,344
Financing receivables, net | 120,877 | 104,217 |  |
Card Member loans | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 98,111 | 84,964 |  |
Card Member loans | Small Business |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 27,833 | 22,947 |  |
Card Member loans | Corporate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 51 | 53 |  |
Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, reserves for credit losses | 126 | 59 |  |
Financing receivables, net | 6,960 | 5,357 |  |
Variable Interest Entity, Primary Beneficiary | Card Member loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 28,590 | 28,461 |  |
Variable Interest Entity, Primary Beneficiary | Card Member loans | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | $ 28,600 | $ 28,500 |  |

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