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Proposed Merger with Dow Chemical (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2016
Proposed Merger with Dow Chemical [Abstract] |  |
Merger related transaction costs | $ 122 | $ 222

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- Definition Transaction costs associated with the planned merger with the Dow Chemical Company. + References No definition available. + Details
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- Definition Proposed Merger with Dow Chemical [Abstract] + References No definition available. + Details
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