Divestitures and Other Transactions Divestitures and Other Transactions - Divested Ag Business Results of Operations (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
	Sep. 30, 2017	Aug. 31, 2017	Sep. 30, 2018	Aug. 31, 2017	Sep. 30, 2018
Predecessor [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations after income taxes		$ 29		$ 119
Predecessor [Member] | Divested Ag Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales, Discontinued Operations		191		1,068
Cost of Goods Sold, Discontinued Operations		79		412
Other Operating Charges, Discontinued Operations		5		17
Research and Development Expense, Discontinued Operations		24		95
Selling, General and Administrative, Discontinued Operations		46		146
Sundry income - net, Discontinued Operations		0		7
Income from Discontinued Operation, before Income Taxes		37		405
Provision for Income Taxes, Discontinued Operation		8		79
(Loss) income from discontinued operations after income taxes		$ 29		$ 326
Successor [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations after income taxes	$ (20)		$ 0		$ (5)
Successor [Member] | Divested Ag Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales, Discontinued Operations	116
Cost of Goods Sold, Discontinued Operations	110
Research and Development Expense, Discontinued Operations	9
Selling, General and Administrative, Discontinued Operations	29
Sundry income - net, Discontinued Operations	0
Income from Discontinued Operation, before Income Taxes	(32)				(10)
Provision for Income Taxes, Discontinued Operation	(12)
(Loss) income from discontinued operations after income taxes	$ (20)				$ (5)