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Stockholders' Equity - Effects of Changes in Noncontrolling Interest (Details) - USD ($)
$ in Millions
1 Months Ended
Aug. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Air Asia      
Noncontrolling Interest [Line Items]      
Equity interests held prior to acquisition 75.00%    
Cash consideration $ 62    
trivago      
Noncontrolling Interest [Line Items]      
Ownership interest percentage   59.30% 59.50%
AAE Travel Pte. Ltd.      
Noncontrolling Interest [Line Items]      
Ownership interest percentage 25.00%