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Goodwill and Other Intangible Assets Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2018
Aug. 31, 2017
Sep. 30, 2018
Goodwill [Line Items]      
Goodwill, Beginning Balance     $ 45,589
Currency Translation Adjustment     (488)
Goodwill Impairment Charge $ (4,503)   (4,503)
Goodwill, Ending Balance 40,988   40,988
Merger with Dow [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance      
Measurement Period Adjustments     392
Goodwill, Ending Balance   $ 45,497  
H&N Acquisition [Member]      
Goodwill [Line Items]      
Measurement Period Adjustments     (2)
Restructuring and asset related charges - net | In Process Research and Development [Member]      
Goodwill [Line Items]      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 85   85
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill), After Tax $ 66   $ 66