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Commitments and Contingencies - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2019
Dec. 31, 2016
Dec. 31, 2019
Loss Contingencies [Line Items]            
Outstanding commitments           $ 2,600,000,000
Value added tax receivable           $ 22,000,000
Percentage of bookings affected (fraction of)           1.00%
Foreign Tax Authority | Indian Income Tax Litigation            
Loss Contingencies [Line Items]            
Interest and penalties related to income taxes           $ 45,000,000
US Airways Litigation            
Loss Contingencies [Line Items]            
Damages awarded $ 15,000,000       $ 15,000,000  
Litigation accrual     $ 32,000,000   32,000,000 0
Attorney fees and expenses         $ 17,000,000  
Accrued loss       $ 32,000,000   32,000,000
US Airways Litigation | US Airways            
Loss Contingencies [Line Items]            
Damages awarded   $ 15,000,000 $ 5,000,000      
Damages sought   $ 125,000,000        
Department Of Justice Lawsuit            
Loss Contingencies [Line Items]            
Payments for legal settlements           20,000,000
Department Of Justice Lawsuit | Maximum            
Loss Contingencies [Line Items]            
Estimate of possible loss           $ 25,000,000