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, 2023	Mar. 31, 2022
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity	$ 17	$ 30
Acquisition-related deposit	252	0
Liabilities assumed	(2)	(2)
Contingent/deferred purchase consideration	(4)	(4)
Net cash outflow for acquisitions	263	24
Interest paid	165	171
Income taxes paid, net of refunds	$ 223	$ 201