Supplemental Disclosures to the Consolidated Statements of Cash Flows (Schedule of Supplemental Cash Flow Disclosures) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity	$ 9,724	$ 1,292	$ 734
Acquisition-related deposit	0	0	24
Fiduciary liabilities assumed	(421)	(93)	(6)
Liabilities assumed	(571)	(182)	(49)
Non-controlling interests assumed	0	0	(5)
Fair value of previously-held equity method investment	0	0	(6)
Contingent/deferred purchase consideration	(190)	(41)	(120)
Net cash outflow for acquisitions	8,542	976	572
Interest paid	591	499	431
Income taxes paid, net of refunds	$ 1,239	$ 1,119	$ 1,049