Reserves for Credit Losses (Details 2) - 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 Receivables
Reserve for Losses [Roll Forward]
Beginning Balance	223	76	229	64
Provisions for credit losses	230	138	452	218
Net write-offs	(243)	(95)	(473)	(162)
Other	0	0	2	(1)
Ending Balance	210	119	210	119
Recoveries	$ 76	$ 67	$ 145	$ 134