Acquisitions and Dispositions (Pro-Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Revenue	$ 4,587	$ 4,019	$ 14,730	$ 12,955
Net income attributable to the Company	$ 538	$ 322	$ 2,345	$ 1,655
Basic net income per share attributable to the Company (in dollars per share)	$ 1.06	$ 0.63	$ 4.62	$ 3.27
Diluted net income per share attributable to the Company (in dollars per share)	$ 1.05	$ 0.63	$ 4.57	$ 3.24