Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Statement of Cash Flows [Abstract]
Sales of premises and equipment	$ 1,000,000	$ 0
Cash and cash equivalents reconciliation
Total cash and cash equivalents	40,836,000,000	27,678,000,000	$ 33,914,000,000	$ 22,028,000,000
Restricted balances included in Cash and cash equivalents	549,000,000	2,207,000,000	544,000,000	525,000,000
Total Cash and cash equivalents, excluding restricted balances	40,287,000,000	$ 25,471,000,000	$ 33,370,000,000	$ 21,503,000,000
Increase in Card Member loans and receivables, and other loans, non-cash	117,000,000
Increase in short-term borrowings, non-cash	$ 117,000,000