Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Information
Interest paid note repurchase premiums	$ 9	$ 32	$ 9
Decrease (increase) in current assets:
Receivables	(32)	(14)	59
Inventories	16	(13)	(26)
Prepaid expenses and other	145	(4)	(1)
Increase (decrease) in current liabilities:
Accounts payable	(58)	100	103
Accrued liabilities	(31)	21	12
Salaries and wages	32	12	(3)
U.S. and foreign income taxes	18	(14)	(27)
Changes in components of working capital, total	90	88	117
Amount of receivables sold	318	317
Interest paid in cash	261	227	199
Income taxes paid in cash (all non-US)	$ 99	$ 101	$ 101