Current Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities, Current [Abstract]
Asset retirement obligations	$ 19	$ 9
Benefit obligations (Note 15)	30	31
Customer rebates	65	51
Derivatives (Note 22)	3	3
Environmental (Note 16)	14	14
Insurance	5	6
Interest	17	15
Restructuring (Note 18)	5	16
Salaries and benefits	113	97
Sales and use tax/foreign withholding tax payable	16	21
Other	67	59
Total	$ 354	$ 322