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Loans and Card Member Receivables - Summary (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Card Member Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | $ 126,619 | $ 125,995 |  |
Less: Reserves for credit losses | 5,271 | 5,118 | $ 4,053 | $ 3,747
Financing receivables, net | 121,348 | 120,877 |  |
Card Member Loans | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 96,789 | 98,111 |  |
Card Member Loans | Small Business |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 29,733 | 27,833 |  |
Card Member Loans | Corporate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 97 | 51 |  |
Other Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Less: Reserves for credit losses | 136 | 126 |  |
Financing receivables, net | 7,465 | 6,960 |  |
Card Member Receivables |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 59,775 | 60,411 |  |
Less: Reserves for credit losses | 151 | 174 | $ 223 | $ 229
Financing receivables, net | 59,624 | 60,237 |  |
Card Member Receivables | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 24,015 | 25,578 |  |
Card Member Receivables | Small Business |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 19,084 | 19,286 |  |
Card Member Receivables | Corporate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 16,676 | 15,547 |  |
Variable Interest Entity, Primary Beneficiary | Card Member Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 27,325 | 28,590 |  |
Variable Interest Entity, Primary Beneficiary | Card Member Loans | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 27,300 | 28,600 |  |
Variable Interest Entity, Primary Beneficiary | Card Member Receivables |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 4,851 | 4,587 |  |
Variable Interest Entity, Primary Beneficiary | Card Member Receivables | Corporate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | $ 4,900 | $ 4,600 |  |

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