Loans and Card Member Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Card Member loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	$ 107,964	$ 88,562
Financing receivables, reserves for credit losses	3,747	3,305	$ 5,344	$ 4,027
Financing receivables, net	104,217	85,257
Card Member loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	84,964	70,467
Card Member loans | Small Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	22,947	18,040
Card Member loans | Corporate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	53	55
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, reserves for credit losses	59	52
Financing receivables, net	5,357	2,859
Other | PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	7	36
Variable Interest Entity, Primary Beneficiary | Card Member loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	28,461	26,587
Variable Interest Entity, Primary Beneficiary | Card Member loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	$ 28,500	$ 26,600