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Divestitures and Other Transactions Divestitures and Other Transactions - PChem Narrative (Details) - USD ($)
$ in Millions
8 Months Ended 12 Months Ended
Aug. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Predecessor [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Separation Related Transaction Costs   $ 35  
Predecessor [Member] | Discontinued Operations [Member] | PFOA Matters: Multi-District Litigation [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss Related to Litigation Settlement $ 335    
Loss Related To Litigation Settlement, Net Of Tax $ 214    
Accounts and Notes Receivable [Member] | Successor [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Indemnification Assets     $ 80
Other Assets [Member] | Successor [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Indemnification Assets     298
Accrued and Other Current Liabilities [Member] | Successor [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Indemnification Liabilities     80
Other Noncurrent Obligations [Member] | Successor [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Indemnification Liabilities     $ 298