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Loans and Card Member Receivables - Performance (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances |  | $ 1,733
Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | $ 2,096 |
30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 176 |
90+ Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 48 |
Card Member Loans | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances |  | 781
Card Member Loans | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances |  | 267
Card Member Loans | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances |  | 0
Card Member Loans | Current | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 1,020 |
Card Member Loans | Current | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 366 |
Card Member Loans | Current | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 0 |
Card Member Loans | 30-89 Days Past Due | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 73 |
Card Member Loans | 30-89 Days Past Due | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 34 |
Card Member Loans | 30-89 Days Past Due | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 0 |
Card Member Loans | 90+ Days Past Due | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 20 |
Card Member Loans | 90+ Days Past Due | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 11 |
Card Member Loans | 90+ Days Past Due | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 0 |
Card Member Receivables | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances |  | 257
Card Member Receivables | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances |  | 403
Card Member Receivables | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances |  | 6
Card Member Receivables | Current | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 257 |
Card Member Receivables | Current | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 402 |
Card Member Receivables | Current | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 9 |
Card Member Receivables | 30-89 Days Past Due | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 20 |
Card Member Receivables | 30-89 Days Past Due | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 43 |
Card Member Receivables | 30-89 Days Past Due | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 2 |
Card Member Receivables | 90+ Days Past Due | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 5 |
Card Member Receivables | 90+ Days Past Due | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 10 |
Card Member Receivables | 90+ Days Past Due | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 1 |
Other Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances |  | $ 19
Other Loans | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 42 |
Other Loans | 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | 4 |
Other Loans | 90+ Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account Balances | $ 1 |

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