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Special Charges - Additional Information (Detail) technician in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) technician | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Special Charges [Line Items] |  |  |  |  |  |
Impairment of assets |  | $ 111,000,000 | $ 0 |  | $ 134,000,000 | $ 0
Severance and benefits costs |  | 11,000,000 | 41,000,000 |  | 25,000,000 | 78,000,000
Other special charges |  | (7,000,000) | (3,000,000) |  | (10,000,000) | (17,000,000)
Other special charges, net of tax |  | 5,000,000 |  |  | 8,000,000 |
International Brotherhood of Teamsters |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Severance and benefits costs |  | 6,000,000 |  |  | 14,000,000 |
Severance and benefits costs net of tax |  | 4,000,000 |  |  | 11,000,000 |
Voluntary early out program |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Severance and benefits costs |  |  | 36,000,000 |  |  | 57,000,000
Severance and benefits costs net of tax |  |  | 23,000,000 |  |  | 37,000,000
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 |  | 5,000,000 | 5,000,000 |  | 11,000,000 | 21,000,000
Severance and benefits costs net of tax |  | 4,000,000 | $ 3,000,000 |  | 8,000,000 | $ 13,000,000
Certain Fleet Types and Certain International Slots |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Impairment of assets |  | 6,000,000 |  |  | 29,000,000 |
Impairment of assets, net of tax |  | $ 5,000,000 |  |  | $ 22,000,000 |
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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