Reserves for Credit Losses (Details 1) - 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 Loans
Reserve for Losses [Roll Forward]
Beginning Balance	3,305	5,344
Total provisions for credit losses	(111)	(573)
Other	2	0
Ending Balance	2,981	4,467
Net (write-offs) recoveries from TDRs	(55)	(45)
Foreign currency translation adjustments	2	(1)
Card Member Loans | Principal
Reserve for Losses [Roll Forward]
Net write-offs	(165)	(241)
Recoveries	144	168
Card Member Loans | Interest and fees
Reserve for Losses [Roll Forward]
Net write-offs	$ (50)	$ (63)