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Contingencies - Antitrust Litigation and Investigations (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2019
Sep. 30, 2020
Nov. 30, 2017
Loss Contingencies [Line Items]            
Percentage of bookings affected (fraction of)           1.00%
Value added tax receivable         $ 23,000,000  
Foreign Tax Authority | Indian Income Tax Litigation            
Loss Contingencies [Line Items]            
Estimated loss         44,000,000  
US Airways Litigation            
Loss Contingencies [Line Items]            
Damages awarded $ 15,000,000 $ 15,000,000        
Loss contingency accrual     $ 32,000,000   $ 0  
Reasonable attorneys' fees, expenses and costs   17,000,000        
Loss contingency reversal       $ 32,000,000    
US Airways Litigation | US Airways            
Loss Contingencies [Line Items]            
Damages awarded   15,000,000 $ 5,000,000      
Attorneys' fees and costs sought   $ 125,000,000