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Acquisitions and Divestitures - Assets Held for Sale (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Airplane
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charge   $ 66 $ 351    
Assets held for sale | Detroit Properties and Airplanes          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charge       $ 49  
Assets held for sale | Corporate-related | Detroit Properties and Airplanes          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charge       10  
Disposed of by sale | Detroit Airplane          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of airplanes sold | Airplane 1        
Consideration for disposal group $ 36     36  
Disposed of by sale | Detroit Properties and Airplane          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Consideration for disposal group         $ 35
Americas | Assets held for sale | Detroit Properties and Airplanes          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charge       $ 39