Supplemental Disclosures of Cash Flow Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Supplemental disclosures of cash flow information:
Cash and cash equivalents		$ 1,135	$ 2,198	$ 1,262
Fiduciary funds (included in fiduciary assets)		3,227	2,967
Cash and cash equivalents and fiduciary funds (included in current assets held for sale)		0	7
Total cash, cash equivalents and restricted cash		4,362	5,172
DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	[1]	(380)	(2,485)
Non-Fiduciary [Member]
Supplemental disclosures of cash flow information:
DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		(130)	(2,274)
Fiduciary [Member]
Supplemental disclosures of cash flow information:
DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		$ (250)	$ (211)

[1] The amounts of cash, cash equivalents and restricted cash, their respective classification on the condensed consolidated balance sheets as well as their respective portions of the increase or decrease in cash, cash equivalents and restricted cash for each of the periods presented have been included in Note 19 — Supplemental Disclosures of Cash Flow Information.