Reserves for Credit Losses (Details 1) - USD ($) $ in Millions	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	$ (606)	$ 377	$ (1,281)
Card Member Loans
Reserve for Losses [Roll Forward]
Beginning Balance	2,981	4,467	3,305	5,344
Total provisions for credit losses	272	(396)	161	(969)
Other	(9)	7	(7)	7
Ending Balance	2,997	3,835	2,997	3,835
Net (write-offs) recoveries from TDRs	(53)	(43)	(108)	(88)
Foreign currency translation adjustments	(8)	7	(6)	6
Card Member Loans | Principal
Reserve for Losses [Roll Forward]
Net write-offs	(192)	(185)	(357)	(426)
Recoveries	138	172	283	340
Card Member Loans | Interest and fees
Reserve for Losses [Roll Forward]
Net write-offs	$ (55)	$ (58)	$ (105)	$ (121)