Divestitures and Other Transactions Divestitures and Other Transactions - Divested Ag Business Depreciation and Capital Expenditures (Details) - Divested Ag Business [Member] - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
Successor [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation, Discontinued Operations	$ 0
Capital Expenditures, Discontinued Operations	$ 5
Predecessor [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation, Discontinued Operations		$ 21	$ 32
Capital Expenditures, Discontinued Operations		$ 8	$ 40