Inventories Schedule of Inventory (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Sep. 01, 2017
Inventory [Line Items]
Finished Products	$ 4,390		$ 4,204
Semi-finished Products	1,338		1,769
Raw Materials	523		481
Stores and Supplies	385		441
Total	6,636		6,895
Adjustment of inventories to a LIFO basis	511		512
Total inventories	7,147		$ 7,407
Merger with Dow [Member]
Inventory [Line Items]
Business Combination, Fair Value Step Up Of Acquired Inventory				$ 3,840
Business Combination, Fair Value Step-Up Of Acquired Inventory, Amount recognized in Cost of Goods sold	$ 205	$ 641

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Business Combination, Fair Value Step-Up Of Acquired Inventory, Amount recognized in Cost of Goods sold

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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