Loans and Card Member Receivables - TDR Subsequently Defaulted (Details 7) account in Thousands, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($) account	Jun. 30, 2022 USD ($) account
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts | account	5	10
Aggregated Outstanding Balances Upon Default | $	$ 33	$ 72
Card Member Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts | account	4	8
Aggregated Outstanding Balances Upon Default | $	$ 23	$ 52
Card Member Receivables
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts | account	1	2
Aggregated Outstanding Balances Upon Default | $	$ 10	$ 20
Other Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Accounts | account	0	0
Aggregated Outstanding Balances Upon Default | $	$ 0	$ 0