Acquisitions and Dispositions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Cash	$ 210	$ 405
Estimated fair value of deferred/contingent consideration	17	141
Total consideration	227	546
Allocation of purchase price:
Goodwill	15,576	$ 15,648	$ 16,317	$ 15,517
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	210
Estimated fair value of deferred/contingent consideration	17
Total consideration	227
Allocation of purchase price:
Cash and cash equivalents	19
Cash and cash equivalents held in a fiduciary capacity	2
Net receivables	12
Other current assets	1
Goodwill	139
Other intangible assets	82
Fixed assets, net	2
Total assets acquired	257
Current liabilities	25
Fiduciary liabilities	2
Other liabilities	3
Total liabilities assumed	30
Net assets acquired	$ 227