Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Sale of premises and equipment	$ 6	$ 2	$ 1
Increase in short-term borrowings, non-cash		117
Increase in loans and Card Member receivables, including Card Member loans held for sale, non-cash		117
Net income taxes paid	3,600	3,300	3,000
Interest paid	$ 8,200	$ 6,400	$ 2,200