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Loans and Card Member Receivables - Performance (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Current |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | $ 2,842 | $ 3,029
30-89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 221 | 235
90+ Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 77 | 79
Card Member Loans | Current | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 1,597 | 1,635
Card Member Loans | Current | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 596 | 535
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 | 106 | 106
Card Member Loans | 30-89 Days Past Due | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 59 | 51
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 | 39
Card Member Loans | 90+ Days Past Due | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 20 | 17
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 | 215 | 312
Card Member Receivables | Current | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 345 | 468
Card Member Receivables | Current | Corporate |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 8 | 8
Card Member Receivables | 30-89 Days Past Due | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 13 | 23
Card Member Receivables | 30-89 Days Past Due | Small Business |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 35 | 48
Card Member Receivables | 30-89 Days Past Due | Corporate |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 3 | 1
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 | 8 | 13
Card Member Receivables | 90+ Days Past Due | Corporate |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 1 | 2
Other Loans | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Account balances | 81 | 71
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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