Acquisitions and Dispositions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Cash	$ 147	$ 367
Estimated fair value of deferred/contingent consideration	11	138
Total consideration	158	505
Allocation of purchase price:
Goodwill	15,963	$ 15,775	$ 16,317	$ 15,517
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	147
Estimated fair value of deferred/contingent consideration	11
Total consideration	158
Allocation of purchase price:
Cash and cash equivalents	18
Cash and cash equivalents held in a fiduciary capacity	2
Net receivables	2
Goodwill	104
Other intangible assets	57
Fixed assets, net	1
Total assets acquired	184
Current liabilities	22
Fiduciary liabilities	2
Other liabilities	2
Total liabilities assumed	26
Net assets acquired	$ 158