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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