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Special Charges and Mark-to-Market ("MTM") Adjustments - Narrative (Details) Employee in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2017 USD ($) Employee | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Early lease termination charge |  | $ 6,000,000 |  |  |  |
Other miscellaneous impairments |  | 8,000,000 |  |  |  |
Fair value adjustment for aircraft purchased off lease and impairments related to certain fleet types and certain international slots no longer in use |  |  | $ 6,000,000 |  | $ 8,000,000 | $ 29,000,000
Severance and benefit costs |  | 6,000,000 | 11,000,000 |  | 12,000,000 | 25,000,000
Gain for the change in fair value of certain derivative assets |  | 4,000,000 |  |  | 1,000,000 |
Use Rights |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Write off of intangible asset | $ 105,000,000 |  |  |  |  |
Azul |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Gain (loss) for the change in fair value of equity investments |  | 38,000,000 | (135,000,000) |  | 52,000,000 | (90,000,000)
Management |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance and benefit costs |  | 6,000,000 | 5,000,000 |  | 10,000,000 | 11,000,000
International Brotherhood of Teamsters | Voluntary Early-Out Program |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance and benefit costs |  |  | $ 6,000,000 |  | $ 2,000,000 | $ 14,000,000
Number of technicians and related employees electing to voluntarily separate from the Company | Employee |  |  |  | 1 |  |
Severance payment per participant (up to) |  |  |  | $ 100,000 |  |
Aircraft Engines |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Impairment of assets removed from operations |  | $ 47,000,000 |  |  |  |

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