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Card Balances and Other Loans - Summary (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Card Balances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	$ 213,311	$ 213,863
Financing receivable, reserves for credit losses	6,065	6,089	$ 5,740	$ 5,850
Financing receivables, net	207,247	207,774
Card Balances \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	140,908	144,324
Card Balances \| Small Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	55,098	53,632
Card Balances \| Corporate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	17,306	15,907
Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	10,849	10,928
Financing receivable, reserves for credit losses	314	323	$ 244	$ 194
Financing receivables, net	10,535	10,605
Variable Interest Entity, Primary Beneficiary \| Card Balances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	33,386	33,378
Variable Interest Entity, Primary Beneficiary \| Card Balances \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	$ 33,400	$ 33,400