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Special Charges and Mark-to-Market Adjustments - Additional Information (Detail) technician in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) technician | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Special Charges [Line Items] |  |  |  |  |  |
Impairment of assets |  | $ 11,000,000 | $ 15,000,000 |  | $ 145,000,000 | $ 15,000,000
Severance and benefits costs |  | 9,000,000 | 23,000,000 |  | 34,000,000 | 101,000,000
Gain (loss) on other special items |  | 3,000,000 | (12,000,000) |  | (7,000,000) | (29,000,000)
Gain (loss) on other special items, net of tax |  | 2,000,000 |  |  | (5,000,000) |
Gain (loss) from equity method investments |  | 29,000,000 |  |  | (61,000,000) |
Gain (loss) from equity method investments, net of tax |  | 23,000,000 |  |  | (47,000,000) |
Tropical Storms |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Loss on unusual item |  |  | 12,000,000 |  |  | 17,000,000
Loss on unusual item, net of tax |  |  | 7,000,000 |  |  | 11,000,000
International Brotherhood of Teamsters |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Severance and benefits costs |  | 5,000,000 |  |  | 19,000,000 |
Severance and benefits costs net of tax |  | 4,000,000 |  |  | 15,000,000 |
Maintenance service agreement |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Intangible asset impairment |  |  | 15,000,000 |  |  |
Intangible asset impairment, net of tax |  |  | 10,000,000 |  |  |
Voluntary early out program |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Severance and benefits costs |  |  | 16,000,000 |  |  | 73,000,000
Severance and benefits costs net of tax |  |  | 10,000,000 |  |  | 47,000,000
Voluntary early out program | International Brotherhood of Teamsters |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Number of positions eliminated | technician |  |  |  | 1 |  |
Voluntary early out program | International Brotherhood of Teamsters | Maximum |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Severance payment per participant |  |  |  | $ 100,000 |  |
Management reorganization initiative |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Severance and benefits costs |  | 4,000,000 | 7,000,000 |  | 15,000,000 | 28,000,000
Severance and benefits costs net of tax |  | 3,000,000 | $ 5,000,000 |  | 12,000,000 | $ 18,000,000
Certain Fleet Types and Certain International Slots |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Impairment of assets |  | 11,000,000 |  |  | 40,000,000 |
Impairment of assets, net of tax |  | $ 9,000,000 |  |  | $ 31,000,000 |
Brazil Routes |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Intangible asset impairment | $ 105,000,000 |  |  |  |  |
Intangible asset impairment, net of tax | $ 82,000,000 |  |  |  |  |

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