Subsequent Events (Details) - Subsequent Event $ in Millions	3 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) position
Subsequent Event [Line Items]
Restructuring and related cost, accelerated depreciation	$ 15
Accrual for environmental loss contingencies, revision in estimates		$ 8
NJ Chrome
Subsequent Event [Line Items]
Accrual for environmental loss contingencies, revision in estimates		$ 26
2018 Restructuring Program
Subsequent Event [Line Items]
Restructuring and related cost, expected number of positions eliminated | position		1,100
2018 Restructuring Program | Minimum
Subsequent Event [Line Items]
Restructuring charges	80
2018 Restructuring Program | Maximum
Subsequent Event [Line Items]
Restructuring charges	85
Employee Severance | 2018 Restructuring Program | Minimum
Subsequent Event [Line Items]
Restructuring charges	75
Employee Severance | 2018 Restructuring Program | Maximum
Subsequent Event [Line Items]
Restructuring charges	80
Other Restructuring | 2018 Restructuring Program | Minimum
Subsequent Event [Line Items]
Restructuring charges	35
Other Restructuring | 2018 Restructuring Program | Maximum
Subsequent Event [Line Items]
Restructuring charges	40
Restructuring Costs To Be Expensed As Incurred [Member] | 2018 Restructuring Program
Subsequent Event [Line Items]
Restructuring charges	15
Future Costs Related to Restructuring | 2018 Restructuring Program | Minimum
Subsequent Event [Line Items]
Restructuring charges	20
Future Costs Related to Restructuring | 2018 Restructuring Program | Maximum
Subsequent Event [Line Items]
Restructuring charges	$ 25