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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

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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