Significant Credit Concentrations (Details 1) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Card Member loans and receivables exposure
On-balance sheet	$ 172	$ 177
Card Member Loans and Receivables
Card Member loans and receivables exposure
On-balance sheet	142	117
Unused lines-of-credit	327	314
U.S. | Card Member Loans and Receivables
Card Member loans and receivables exposure
On-balance sheet	115	95
Unused lines-of-credit	261	251
Non-U.S. | Card Member Loans and Receivables
Card Member loans and receivables exposure
On-balance sheet	27	22
Unused lines-of-credit	$ 66	$ 63