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Loans and Card Member Receivables - Performance (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | $ 2,939 | $ 2,096
30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 252 | 176
90+ Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 95 | 48
Card Member Loans | Current | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 1,647 | 1,020
Card Member Loans | Current | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 556 | 366
Card Member Loans | Current | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 0 | 0
Card Member Loans | 30-89 Days Past Due | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 124 | 73
Card Member Loans | 30-89 Days Past Due | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 59 | 34
Card Member Loans | 30-89 Days Past Due | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 0 | 0
Card Member Loans | 90+ Days Past Due | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 48 | 20
Card Member Loans | 90+ Days Past Due | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 23 | 11
Card Member Loans | 90+ Days Past Due | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 0 | 0
Card Member Receivables | Current | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 261 | 257
Card Member Receivables | Current | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 386 | 402
Card Member Receivables | Current | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 11 | 9
Card Member Receivables | 30-89 Days Past Due | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 19 | 20
Card Member Receivables | 30-89 Days Past Due | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 41 | 43
Card Member Receivables | 30-89 Days Past Due | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 3 | 2
Card Member Receivables | 90+ Days Past Due | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 6 | 5
Card Member Receivables | 90+ Days Past Due | Small Business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 14 | 10
Card Member Receivables | 90+ Days Past Due | Corporate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 2 | 1
Other Loans | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 78 | 42
Other Loans | 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | 6 | 4
Other Loans | 90+ Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Account balances | $ 2 | $ 1

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