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Loans and Card Member Receivables - Summary (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Card Member Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | $ 144,814 |  | $ 139,674 |  |  |
Financing receivable, reserves for credit losses | 5,868 | $ 5,767 | 5,679 | $ 5,588 | $ 5,321 | $ 5,118
Financing receivables, net | 138,946 |  | 133,995 |  |  |
Card Member Loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 110,957 |  | 107,646 |  |  |
Card Member Loans | Small Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 33,818 |  | 31,991 |  |  |
Card Member Loans | Corporate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 38 |  | 37 |  |  |
Other Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 10,518 |  | 9,232 |  |  |
Financing receivable, reserves for credit losses | 287 | 272 | 194 | 154 | 140 | 126
Financing receivables, net | 10,231 |  | 9,038 |  |  |
Card Member Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 61,023 |  | 59,411 |  |  |
Financing receivable, reserves for credit losses | 200 | $ 193 | 171 | $ 156 | $ 171 | $ 174
Financing receivables, net | 60,823 |  | 59,240 |  |  |
Card Member Receivables | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 24,446 |  | 25,431 |  |  |
Card Member Receivables | Small Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 19,189 |  | 18,619 |  |  |
Card Member Receivables | Corporate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 17,388 |  | 15,361 |  |  |
Variable Interest Entity, Primary Beneficiary | Card Member Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 26,354 |  | 28,278 |  |  |
Variable Interest Entity, Primary Beneficiary | Card Member Loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 26,400 |  | 28,300 |  |  |
Variable Interest Entity, Primary Beneficiary | Card Member Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | 6,710 |  | 3,927 |  |  |
Variable Interest Entity, Primary Beneficiary | Card Member Receivables | Corporate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivables, gross | $ 6,700 |  | $ 3,900 |  |  |

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