Acquisitions (Pro-Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Business Combinations [Abstract]
Revenue	$ 3,376	$ 3,328	$ 6,721	$ 6,658
Income from continuing operations	480	441	973	949
Net income attributable to the Company	$ 472	$ 431	$ 955	$ 922
Basic net income per share:
Basic net income per share - Continuing operations (in dollars per share)	$ 0.91	$ 0.80	$ 1.83	$ 1.72
Basic net income per share - Net income attributable to the Company (in dollars per share)	0.91	0.81	1.83	1.72
Diluted net income per share:
Diluted net income per share - Continuing operations (in dollars per share)	0.90	0.80	1.82	1.70
Diluted net income per share - Net income attributable to the Company (in dollars per share)	$ 0.90	$ 0.80	$ 1.82	$ 1.70