v3.5.0.2

Commitments and Contingencies - Environmental Remediation - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Loss Contingencies [Line Items] |  |
Environmental contingencies | $ 39 | $ 41
Current reserves for environmental contingencies | 1 | 1
Lake Charles South Facility [Member] |  |
Loss Contingencies [Line Items] |  |
Environmental contingencies | 12 | 12
Natrium West Virginia Facility [Member] |  |
Loss Contingencies [Line Items] |  |
Environmental contingencies | 18 | 18
Calcasieu River Estuary in Lake Charles Louisiana [Member] |  |
Loss Contingencies [Line Items] |  |
Environmental contingencies | $ 3 | $ 4

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