Reserves for Credit Losses (Details 2) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reserve for Losses [Roll Forward]
Provisions for credit losses	$ 778,000,000	$ (191,000,000)	$ 1,155,000,000	$ (1,472,000,000)
Card Member Receivables
Reserve for Losses [Roll Forward]
Beginning Balance	119,000,000	73,000,000	64,000,000	267,000,000
Provisions for credit losses	165,000,000	(12,000,000)	383,000,000	(147,000,000)
Net write-offs	(122,000,000)	(32,000,000)	(284,000,000)	(89,000,000)
Other	(3,000,000)	1,000,000	(4,000,000)	(1,000,000)
Ending Balance	159,000,000	30,000,000	159,000,000	30,000,000
Recoveries	60,000,000	79,000,000	195,000,000	303,000,000
Net (write-offs) recoveries from TDRs	(19,000,000)	(15,000,000)	(48,000,000)	(51,000,000)
Foreign currency translation adjustments	$ (2,000,000)	$ 0	$ (4,000,000)	$ (1,000,000)