Reserves for Credit Losses (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provisions	$ 2,182	$ (1,419)	$ 4,730
Card Member receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	64	267	126
Provisions	627	(73)	1,015
Net write-offs	(462)	(129)	(881)
Other	0	(1)	7
Ending Balance	229	64	267
Recoveries	257	378	386
Net (write-offs) recoveries from TDRs	(73)	(64)	(47)
Card Member receivables | Foreign Currency Translation Adjustments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Foreign currency translation adjustments	$ 2	$ (1)	$ 5