Reserves for Credit Losses (Details 2) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reserve for Losses [Roll Forward]
Total provisions for credit losses	$ 410,000,000	$ (606,000,000)	$ 377,000,000	$ (1,281,000,000)
Card Member Receivables
Reserve for Losses [Roll Forward]
Beginning Balance	76,000,000	202,000,000	64,000,000	267,000,000
Total provisions for credit losses	138,000,000	(125,000,000)	218,000,000	(135,000,000)
Net write-offs	(95,000,000)	(4,000,000)	(162,000,000)	(57,000,000)
Other	0	0	(1,000,000)	(2,000,000)
Ending Balance	119,000,000	73,000,000	119,000,000	73,000,000
Recoveries	67,000,000	127,000,000	134,000,000	224,000,000
Net (write-offs) recoveries from TDRs	(17,000,000)	(16,000,000)	(29,000,000)	(36,000,000)
Foreign currency translation adjustments	$ 0	$ 0	$ 0	$ (1,000,000)