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Acquisitions and Divestitures - Assets Held for Sale (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 Airplane | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | 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 | $ 299 |  |
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 |
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 |

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