Supplemental Disclosures (Supplemental Operating and Financing Cash Flow Items) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating:
Contingent consideration payments for prior year acquisitions	$ (38)	$ (46)
Receipt of contingent consideration for dispositions	0	19
Acquisition/disposition related net charges (credits) for adjustments	38	11
Adjustments and payments related to contingent consideration	0	(16)
Financing:
Contingent consideration for prior year acquisitions	(28)	(26)
Deferred consideration related to prior year acquisitions	(116)	(84)
Payments of deferred and contingent consideration for acquisitions	(144)	(110)
Receipt of contingent consideration for dispositions	$ 3	$ 71