Acquisitions and Dispositions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Cash	$ 332	$ 147
Estimated fair value of deferred/contingent consideration	8	11
Total consideration	340	158
Allocation of purchase price:
Goodwill	16,621	$ 15,963	$ 16,251	$ 16,317
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	332
Estimated fair value of deferred/contingent consideration	8
Total consideration	340
Allocation of purchase price:
Cash and cash equivalents	15
Cash and cash equivalents held in a fiduciary capacity	1
Net receivables	15
Goodwill	236
Other intangible assets	137
Total assets acquired	404
Current liabilities	29
Fiduciary liabilities	1
Other liabilities	34
Total liabilities assumed	64
Net assets acquired	$ 340