Divestitures and Other Transactions Divestitures and Other Transactions - Divested Ag Business Results of Operations (Details) - USD ($) $ in Millions			4 Months Ended		8 Months Ended	12 Months Ended
		Nov. 01, 2017	Dec. 31, 2017		Aug. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Finite-Lived Intangible Assets, Gross						$ 10,750	$ 4,152
Income (loss) from discontinued operations after income taxes			$ (568)		$ 1,403	(671)	1,748
Divested Ag Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair Value - H&N Business		$ 1,970
Finite-Lived Intangible Assets, Gross			495
Income (loss) from discontinued operations after income taxes			(77)	[1]	326	80	(5)
Income (Loss) from Discontinued Operation, before Income Tax			(127)	[1]	405		(10)
Net Sales			199	[1]	1,068
Cost of Goods Sold			194	[1]	412
Other Operating Charges					17
Research and Development Expense			30	[1]	95
Selling, General and Administrative	[2]		102	[1]	146
Other Income - net			0	[1]	7
Provision for (Benefit from) Income Taxes, Discontinued Operation			(50)	[1]	$ 79
Disposal Group, Including Discontinued Operation, Transaction Costs			44
Favorable Supply Contract [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Finite-Lived Intangible Assets, Gross						$ 475	$ 475
Favorable Supply Contract [Member] | Divested Ag Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Finite-Lived Intangible Assets, Gross			$ 495
Discontinued Operations, Disposed of by Sale [Member] | Divested Ag Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses		$ 1,200

[1] Includes results of operations for the period September 1 through October 31, 2017, as the Divested Ag Business was disposed of on November 1, 2017.

[2] Successor period includes $44 million of transaction costs associated with the disposal of the Divested Ag Business.