Acquisitions and Dispositions (Pro-Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Revenue	$ 5,017	$ 4,231	$ 10,137	$ 8,970
Net income attributable to the Company	$ 820	$ 577	$ 1,806	$ 1,332
Basic net income per share attributable to the Company (in dollars per share)	$ 1.61	$ 1.14	$ 3.55	$ 2.64
Diluted net income per share attributable to the Company (in dollars per share)	$ 1.60	$ 1.13	$ 3.52	$ 2.61