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Loans and Card Member Receivables - Summary (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Card Member Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | $ 117,978 |  | $ 107,964 |  |  |
Less: Reserves for credit losses | 4,721 | $ 4,390 | 3,747 | $ 3,319 | $ 2,997 | $ 3,305
Financing receivables, net | 113,257 |  | 104,217 |  |  |
Card Member Loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 90,900 |  | 84,964 |  |  |
Card Member Loans | Small Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 27,022 |  | 22,947 |  |  |
Card Member Loans | Corporate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 56 |  | 53 |  |  |
Other Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Reserves for credit losses | 108 |  | 59 |  |  |
Financing receivables, net | 6,483 |  | 5,357 |  |  |
Card Member Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 58,825 |  | 57,613 |  |  |
Less: Reserves for credit losses | 174 | $ 210 | 229 | $ 159 | $ 119 | $ 64
Financing receivables, net | 58,651 |  | 57,384 |  |  |
Card Member Receivables | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 22,239 |  | 22,885 |  |  |
Card Member Receivables | Small Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 19,575 |  | 19,629 |  |  |
Card Member Receivables | Corporate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 17,011 |  | 15,099 |  |  |
Variable Interest Entity, Primary Beneficiary | Card Member Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 27,215 |  | 28,461 |  |  |
Variable Interest Entity, Primary Beneficiary | Card Member Loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 27,200 |  | 28,500 |  |  |
Variable Interest Entity, Primary Beneficiary | Card Member Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 5,382 |  | 5,193 |  |  |
Variable Interest Entity, Primary Beneficiary | Card Member Receivables | Corporate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | $ 5,400 |  | $ 5,200 |  |  |

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