Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2023	Jun. 30, 2023	Jun. 30, 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		42,958,000,000	26,277,000,000	$ 33,914,000,000	$ 22,028,000,000
Restricted balances included in Cash and cash equivalents		1,231,000,000	1,086,000,000	544,000,000	525,000,000
Total Cash and cash equivalents, excluding restricted balances		$ 41,727,000,000	$ 25,191,000,000	$ 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