Current Other Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Other Liabilities, Current [Abstract]
Asset retirement obligations	$ 3	$ 19
Benefit obligations (Note 11)	30	30
Customer rebates	52	65
Derivatives (Note 16)	6	3
Environmental (Note 12)	18	14
Insurance	5	5
Interest	24	17
Restructuring (Note 14)	7	5
Salaries and benefits	93	113
Sales and use tax/foreign withholding tax payable	34	16
Other	42	67
Total	$ 314	$ 354