Reserves for Credit Losses (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reserve for Losses [Roll Forward]
Provisions for credit losses	$ 1,198	$ 410	$ 2,253	$ 377
Card Member Loans
Reserve for Losses [Roll Forward]
Beginning Balance	4,053	2,981	3,747	3,305
Provisions for credit losses	923	272	1,709	161
Other	11	(9)	17	(7)
Ending Balance	4,390	2,997	4,390	2,997
Foreign currency translation adjustments	12	(8)	18	(6)
Card Member Loans | Principal
Reserve for Losses [Roll Forward]
Net write-offs	(490)	(192)	(887)	(357)
Recoveries	130	138	258	283
Card Member Loans | Interest and fees
Reserve for Losses [Roll Forward]
Net write-offs	$ (107)	$ (55)	$ (196)	$ (105)