v3.5.0.2
Commitments and Contingencies - Environmental Remediation - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Environmental contingencies $ 41 $ 54
Current reserves for environmental contingencies 1 12
Lake Charles South Facility [Member]    
Loss Contingencies [Line Items]    
Environmental contingencies 12 15
Natrium West Virginia Facility [Member]    
Loss Contingencies [Line Items]    
Environmental contingencies 18 15
Calcasieu River Estuary in Lake Charles Louisiana [Member]    
Loss Contingencies [Line Items]    
Environmental contingencies $ 4 $ 18