Description of Business and Basis of Consolidation and Presentation (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	3
Supplemental Cash Flow Elements [Abstract]
Non-cash purchase price consideration		$ 89
Dividends Payable	$ 226	195
Accrued withholding tax payments related to net share settlements on restricted stock rights	$ 17	$ 45