Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Supplemental Cash Flow Information
Interest paid in cash	$ 88	$ 98
Income taxes paid in cash	34	33
Interest paid for note repurchase premiums related to debt repaid prior to maturity		16
Amount of receivables sold	216	202
U.S.
Supplemental Cash Flow Information
Income taxes paid in cash	3	3
Non-U.S.
Supplemental Cash Flow Information
Income taxes paid in cash	$ 31	$ 30