Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Cash Flows [Abstract]
Sale of premises and equipment	$ 2	$ 1	$ 88
Increase in short-term borrowings, non-cash	117
Increase in Card Member loans and receivables, and other loans, non-cash	117
Net income taxes paid	3,300	3,000	1,600
Interest paid	$ 6,400	$ 2,200	$ 1,100