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Divestitures and Other Transactions Divestitures and Other Transactions - PChem Narrative (Details) - USD ($)
$ in Millions
8 Months Ended
Aug. 31, 2017
Sep. 30, 2018
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]    
Other Tax Benefit $ 10  
Loss Related to Litigation Settlement 335  
Loss Related To Litigation Settlement, Net Of Tax $ 214  
Accounts and Notes Receivable, Net [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnification Assets   $ 95
Other Assets [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnification Assets   313
Accrued and Other Current Liabilities [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnification Liabilities   95
Other noncurrent obligations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnification Liabilities   $ 313