Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Supplemental Cash Flow Information
Interest paid in cash	$ 209	$ 214
Income taxes paid in cash (all non-US)	120	93
Interest paid for note repurchase premiums related to debt repaid prior to maturity	16
Amount of receivables sold	$ 145	$ 240