Restructuring, Impairment and Plant Closing and Transition Costs - Accrued Restructuring and Plant Closing and Transition Costs by Type of Cost and Initiative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) position	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Accrued restructuring costs roll forward
Accrued liabilities at the beginning of the period	$ 32	$ 34	$ 21
Restructuring charges	5
Restructuring Reserve Distribution Of Prefunded Restructuring Costs			(1)
Reversal of reserves no longer required		0	1
Foreign currency effect on liability balance		(2)	1
Accrued liabilities at the end of the period	16	32	34
2016 and prior initiatives
Accrued restructuring costs roll forward
Restructuring charges			8
Restructuring payments			(20)
2017 initiatives
Accrued restructuring costs roll forward
Restructuring charges			37
Restructuring payments			(12)
2017 and prior initiatives
Accrued restructuring costs roll forward
Accrued liabilities at the beginning of the period	18	34
Restructuring charges		18
Restructuring payments		(33)
Accrued liabilities at the end of the period	7	18	34
2018 initiatives
Accrued restructuring costs roll forward
Accrued liabilities at the beginning of the period	14	0
Restructuring charges		19
Restructuring payments		(4)
Accrued liabilities at the end of the period	9	14	0
2018 and prior initiatives
Accrued restructuring costs roll forward
Restructuring charges	20
Restructuring payments	(36)
2019 initiatives
Accrued restructuring costs roll forward
Accrued liabilities at the beginning of the period	0	0
Restructuring charges	5
Restructuring payments	(5)
Accrued liabilities at the end of the period	0	0	0
Workforce reductions
Accrued restructuring costs roll forward
Accrued liabilities at the beginning of the period	32	34	21
Restructuring Reserve Distribution Of Prefunded Restructuring Costs			(1)
Reversal of reserves no longer required		0
Foreign currency effect on liability balance		(2)	1
Accrued liabilities at the end of the period	$ 15	32	34
Number of positions terminated | position	315
Number of positions not terminated | position	134
Workforce reductions | 2016 and prior initiatives
Accrued restructuring costs roll forward
Restructuring charges			0
Restructuring payments			(12)
Workforce reductions | 2017 initiatives
Accrued restructuring costs roll forward
Restructuring charges			33
Restructuring payments			(8)
Workforce reductions | 2017 and prior initiatives
Accrued restructuring costs roll forward
Restructuring charges		2
Restructuring payments		(17)
Workforce reductions | 2018 initiatives
Accrued restructuring costs roll forward
Restructuring charges		17
Restructuring payments		(2)
Workforce reductions | 2018 and prior initiatives
Accrued restructuring costs roll forward
Restructuring charges	$ 7
Restructuring payments	(24)
Workforce reductions | 2019 initiatives
Accrued restructuring costs roll forward
Restructuring charges	5
Restructuring payments	(5)
Other restructuring costs
Accrued restructuring costs roll forward
Accrued liabilities at the beginning of the period	0	0	0
Restructuring Reserve Distribution Of Prefunded Restructuring Costs			0
Reversal of reserves no longer required		0
Foreign currency effect on liability balance		0	0
Accrued liabilities at the end of the period	1	0	0
Other restructuring costs | 2016 and prior initiatives
Accrued restructuring costs roll forward
Restructuring charges			8
Restructuring payments			(8)
Other restructuring costs | 2017 initiatives
Accrued restructuring costs roll forward
Restructuring charges			4
Restructuring payments			$ (4)
Other restructuring costs | 2017 and prior initiatives
Accrued restructuring costs roll forward
Restructuring charges		16
Restructuring payments		(16)
Other restructuring costs | 2018 initiatives
Accrued restructuring costs roll forward
Restructuring charges		2
Restructuring payments		$ (2)
Other restructuring costs | 2018 and prior initiatives
Accrued restructuring costs roll forward
Restructuring charges	13
Restructuring payments	(12)
Other restructuring costs | 2019 initiatives
Accrued restructuring costs roll forward
Restructuring charges	0
Restructuring payments	$ 0