Acquisitions and Dispositions (Pro-Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Revenue	$ 17,095	$ 17,106	$ 14,400
Net income attributable to the Company	$ 1,866	$ 1,302	$ 1,498
Basic net income per share attributable to the Company (in dollars per share)	$ 3.69	$ 2.58	$ 2.92
Diluted net income per share attributable to the Company (in dollars per share)	$ 3.65	$ 2.55	$ 2.89