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Divestitures and Other Transactions Divestitures and Other Transactions - Narrative (Details) - USD ($) $ in Millions	Nov. 01, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Favorable Supply Agreement Intangible		$ 16,153	$ 16,334
H&N Business [Member] \| Successor [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair Value	$ 1,970
Favorable Supply Contract [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Favorable Supply Agreement Intangible		$ 475	$ 495
Supply Agreements [Member] \| Successor [Member] \| Divested Ag Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Definite-Lived Intangible Asset, Useful Life	5 years