Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Supplemental Cash Flow Information
Interest paid in cash	$ 98	$ 84
Income taxes paid in cash (all non-US)	33	37
Interest paid for note repurchase premiums related to debt repaid prior to maturity	16
Amount of receivables sold	$ 202	$ 268