Loans and Card Member Receivables - TDR Subsequently Defaulted (Details) account in Thousands, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($) account	Sep. 30, 2022 USD ($) account
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts | account	5	15
Aggregated Outstanding Balances Upon Default | $	$ 25	$ 97
Card Member Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts | account	4	12
Aggregated Outstanding Balances Upon Default | $	$ 18	$ 70
Card Member Receivables
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts | account	1	3
Aggregated Outstanding Balances Upon Default | $	$ 7	$ 27
Other Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts | account	0	0
Aggregated Outstanding Balances Upon Default | $	$ 0	$ 0