Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Statement of Cash Flows [Abstract]
Sales of premises and equipment		$ 1	$ 1
Cash and cash equivalents reconciliation
Total cash and cash equivalents		43,908	31,182	$ 33,914	$ 22,028
Restricted balances included in Cash and cash equivalents		468	1,360	544	525
Total Cash and cash equivalents, excluding restricted balances		$ 43,440	$ 29,822	$ 33,370	$ 21,503
Increase in short-term borrowings, non-cash	$ 117
Increase in Card Member loans and receivables, and other loans, non-cash	$ 117