Acquisitions and Dispositions (Pro-Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Business Combinations [Abstract]
Revenue	$ 4,657	$ 4,536
Net income attributable to the Company	$ 754	$ 684
Basic net income per share attributable to the Company (in dollars per share)	$ 1.49	$ 1.35
Diluted net income per share attributable to the Company (in dollars per share)	$ 1.48	$ 1.34