Supplemental Disclosures to the Consolidated Statements of Cash Flows (Schedule of Supplemental Cash Flow Disclosures) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity	$ 65	$ 372
Fiduciary liabilities assumed	(15)	(5)
Liabilities assumed	(7)	(15)
Fair value of previously-held equity method investment	(15)	0
Contingent/deferred purchase consideration	(10)	(51)
Net cash outflow for acquisitions	18	301
Interest paid	317	225
Income taxes paid, net of refunds	$ 237	$ 239