Reserves for Credit Losses (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reserve for Losses [Roll Forward]
Provisions for credit losses	$ 1,055	$ (33)
Card Member Loans
Reserve for Losses [Roll Forward]
Beginning Balance	3,747	3,305
Provisions for credit losses	786	(111)
Other	6	2
Ending Balance	4,053	2,981
Foreign currency translation adjustments	6	2
Card Member Loans | Principal
Reserve for Losses [Roll Forward]
Net write-offs	(397)	(165)
Recoveries	128	144
Card Member Loans | Interest and fees
Reserve for Losses [Roll Forward]
Net write-offs	$ (89)	$ (50)