Land, Buildings, Equipment and Software, Net - Internal Use Software (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Land, Buildings, Equipment and Softward [Abstract]
Internal use software	$ 45	$ 64	$ 57
Internal use software	$ 218	$ 264
Internal Use and Product Software, Useful Lives Minimum	3 years
Internal Use and Product Software, Useful Lives Maximum	7 years