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Long-Term Employee Benefits (Schedule of Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - Pension Plan [Member] - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ 23,946 | $ 25,515
Accumulated benefit obligation | 23,591 | 24,508
Fair value of plan assets | $ 15,838 | $ 16,930

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