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

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