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Special Charges - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) Technician | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Special Charges [Line Items] |  |  |  |  |
Severance and benefits costs | $ 41,000,000 |  | $ 6,000,000 | $ 78,000,000 | $ 14,000,000
Severance and benefits costs net of tax |  |  | 4,000,000 |  | 9,000,000
Labor agreement costs |  |  | 10,000,000 |  | $ 110,000,000
Lease maturity year |  |  |  |  | 2029
Cleveland airport lease restructuring |  |  |  |  | $ 74,000,000
Cleveland airport lease restructuring, net of taxes |  |  |  |  | 47,000,000
(Gains) losses on sale of assets and other special charges | 3,000,000 |  | 6,000,000 | 17,000,000 | 14,000,000
(Gains) losses on sale of assets and other special charges, net of tax | 2,000,000 |  | 4,000,000 | 11,000,000 | 9,000,000
Venezuela local currency loss |  |  |  |  | 8,000,000
Venezuela local currency loss, net of tax |  |  |  |  | 5,000,000
Sale of an affiliate |  |  | 9,000,000 |  |
Sale of an affiliate, net of tax |  |  | 6,000,000 |  |
Accrual severance and benefit | 27,000,000 |  | 30,000,000 | $ 27,000,000 | 30,000,000
Severance-related accrual expected payment date |  |  |  | 2019 |
Accrual for permanently grounded aircraft | 29,000,000 |  | 41,000,000 | $ 29,000,000 | 41,000,000
Grounded aircraft related accrual expected payment date |  |  |  | 2025 |
Newark Liberty International Airport |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |
Impairment of indefinite-lived intangible assets |  |  | 412,000,000 |  |
Impairment of indefinite-lived intangible assets, net of tax benefits |  |  | 264,000,000 |  |
International Brotherhood of Teamsters |  |  |  |  |
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 |
Int'l Association of Machinists |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |
Labor agreement costs |  |  | 10,000,000 |  | 110,000,000
Labor agreement costs net of tax |  |  | $ 6,000,000 |  | $ 70,000,000
Voluntary early out program | International Brotherhood of Teamsters |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |
Number of positions eliminated | Technician |  | 1,000 |  |  |
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 |  |  | 21,000,000 |
Severance and benefits costs net of tax | $ 3,000,000 |  |  | $ 13,000,000 |

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