Reserves for Credit Losses (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reserve for Losses [Roll Forward]
Provisions	$ 2,182	$ (1,419)	$ 4,730
Card Member loans
Reserve for Losses [Roll Forward]
Beginning Balance	3,305	5,344	4,027
Provisions	1,514	(1,155)	3,453
Other	(6)	(5)	34
Ending Balance	3,747	3,305	5,344
Recoveries	539	657	568
Net (write-offs) recoveries from TDRs	(209)	(171)	(134)
Foreign currency translation adjustments	(6)	(6)	35
Card Member loans | Principal
Reserve for Losses [Roll Forward]
Net write-offs	(837)	(672)	(1,795)
Card Member loans | Interest and fees
Reserve for Losses [Roll Forward]
Net write-offs	$ (229)	$ (207)	$ (375)