Restructuring, Impairment and Plant Closing and Transition Costs - Accrued Liabilities by Initiatives (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accrued liabilities by initiatives
Accrued liabilities	$ 16	$ 32	$ 34	$ 21
2017 and prior initiatives
Accrued liabilities by initiatives
Accrued liabilities	7	18	34
2018 initiatives
Accrued liabilities by initiatives
Accrued liabilities	9	14	0
2019 initiatives
Accrued liabilities by initiatives
Accrued liabilities	$ 0	$ 0	$ 0