Supplemental Disclosures of Cash Flow Information (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Supplemental disclosures of cash flow information:
Cash and cash equivalents		$ 1,920	$ 2,217	$ 4,486
Fiduciary funds (included in fiduciary assets)		3,183	3,703
Cash and cash equivalents and fiduciary funds (included in current assets held for sale)		5	0
Other restricted cash (included in prepaids and other current assets)		0	4
Total cash, cash equivalents and restricted cash		5,108	5,924
DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	[1]	(2,413)	(327)
Non-Fiduciary [Member]
Supplemental disclosures of cash flow information:
DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		(2,515)	135
Fiduciary [Member]
Supplemental disclosures of cash flow information:
DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		$ 102	$ (462)

[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.