Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Supplemental Cash Flow Information
Interest paid in cash	$ 214	$ 192
Income taxes paid in cash (all non-US)	93	93
Amount of receivables sold under factoring program	$ 240	$ 336	$ 317