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Commitments and Contingencies - Narrative (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Feb. 25, 2021
Dec. 31, 2016
Dec. 31, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]              
Outstanding commitments             $ 2,900,000,000
Percentage of bookings affected (fraction of)           1.00%  
Value added tax receivable           $ 22,000,000  
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          
Indian Income Tax Litigation | Foreign Tax Authority              
Loss Contingencies [Line Items]              
Interest and penalties related to income taxes           $ 45,000,000  
SynXis Central Reservation System | Subsequent Event              
Loss Contingencies [Line Items]              
Payments for legal settlements       $ 2,000,000