Supplemental Disclosures to the Consolidated Statements of Cash Flows (Additional Information Concerning Acquisitions, Interest And Income Taxes Paid) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity	$ 372	$ 17
Acquisition-related deposit	0	252
Fiduciary liabilities assumed	(5)	0
Liabilities assumed	(15)	(2)
Contingent/deferred purchase consideration	(51)	(4)
Net cash outflow for acquisitions	301	263
Interest paid	225	165
Income taxes paid, net of refunds	$ 239	$ 223