Reserves for Credit Losses (Details 1) - USD ($) $ in Millions	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	$ (191)	$ 1,155	$ (1,472)
Card Member Loans
Reserve for Losses [Roll Forward]
Beginning Balance	2,997	3,835	3,305	5,344
Provisions for credit losses	596	(177)	757	(1,146)
Other	(15)	(8)	(22)	(1)
Ending Balance	3,319	3,489	3,319	3,489
Net (write-offs) recoveries from TDRs	(48)	(36)	(156)	(124)
Foreign currency translation adjustments	(16)	(8)	(22)	(2)
Card Member Loans | Principal
Reserve for Losses [Roll Forward]
Net write-offs	(203)	(118)	(560)	(544)
Recoveries	133	167	415	507
Card Member Loans | Interest and fees
Reserve for Losses [Roll Forward]
Net write-offs	$ (56)	$ (43)	$ (161)	$ (164)