Supplemental Disclosures (Schedule of Supplemental Cash Flow Disclosures) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash, and cash and cash equivalents held in a fiduciary capacity	$ 734	$ 1,697	$ 929
Acquisition-related deposit	24	0	0
Fiduciary liabilities assumed	(6)	(18)	(21)
Liabilities assumed	(49)	(213)	(78)
Non-controlling interests assumed	(5)	(64)	0
Fair value of previously-held equity method investment	(6)	(390)	0
Contingent/deferred purchase consideration	(120)	(153)	(183)
Net cash outflow for acquisitions	572	859	647
Interest paid	431	441	481
Income taxes paid, net of refunds	$ 1,049	$ 1,069	$ 673