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Loans and Card Member Receivables - Performance (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Current |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | $ 2,891 | $ 2,939
30-89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 224 | 252
90+ Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 81 | 95
Card Member Loans | Current | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 1,669 | 1,647
Card Member Loans | Current | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 631 | 556
Card Member Loans | Current | Corporate |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 0 | 0
Card Member Loans | 30-89 Days Past Due | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 114 | 124
Card Member Loans | 30-89 Days Past Due | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 59 | 59
Card Member Loans | 30-89 Days Past Due | Corporate |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 0 | 0
Card Member Loans | 90+ Days Past Due | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 42 | 48
Card Member Loans | 90+ Days Past Due | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 22 | 23
Card Member Loans | 90+ Days Past Due | Corporate |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 0 | 0
Card Member Receivables | Current | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 194 | 261
Card Member Receivables | Current | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 306 | 386
Card Member Receivables | Current | Corporate |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 11 | 11
Card Member Receivables | 30-89 Days Past Due | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 14 | 19
Card Member Receivables | 30-89 Days Past Due | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 28 | 41
Card Member Receivables | 30-89 Days Past Due | Corporate |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 4 | 3
Card Member Receivables | 90+ Days Past Due | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 5 | 6
Card Member Receivables | 90+ Days Past Due | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 9 | 14
Card Member Receivables | 90+ Days Past Due | Corporate |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 2 | 2
Other Loans | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 80 | 78
Other Loans | 30-89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 5 | 6
Other Loans | 90+ Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | $ 1 | $ 2

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