Reserves for Credit Losses (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reserve for Losses [Roll Forward]
Total provisions for credit losses	$ (33)	$ (675)
Card Member Receivables
Reserve for Losses [Roll Forward]
Beginning Balance	64	267
Total provisions for credit losses	80	(10)
Net write-offs	(67)	(53)
Other	(1)	(2)
Ending Balance	76	202
Recoveries	67	97
Net (write-offs) recoveries from TDRs	(12)	(20)
Foreign currency translation adjustments	$ 0	$ (1)