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Special Charges and Mark-to-Market ("MTM") Adjustments - Narrative (Details)
Employee in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Employee
Restructuring Cost and Reserve [Line Items]      
Fair value adjustment for aircraft purchased off lease and impairments related to certain fleet types and certain international slots no longer in use $ 8,000,000 $ 23,000,000  
Severance and benefit costs 6,000,000 14,000,000  
Gain for the change in fair value of certain derivative assets 3,000,000    
Azul      
Restructuring Cost and Reserve [Line Items]      
Gain (loss) for the change in fair value of equity investments 14,000,000 45,000,000  
Management      
Restructuring Cost and Reserve [Line Items]      
Severance and benefit costs 4,000,000 6,000,000  
International Brotherhood of Teamsters | Voluntary Early-Out Program      
Restructuring Cost and Reserve [Line Items]      
Severance and benefit costs $ 2,000,000 $ 8,000,000  
Number of technicians and related employees electing to voluntarily separate from the Company | Employee     1
Severance payment per participant (up to)     $ 100,000