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Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 25, 2018
Aug. 31, 2018
Sep. 30, 2018
Sep. 30, 2018
Apr. 26, 2018
Feb. 28, 2015
Payments for Repurchase of Equity [Abstract]            
Authorized share repurchase         15,000,000 10,000,000
Stock repurchased, shares       5,200,000    
Stock repurchased, value       $ 602    
Average repurchase price per share (in dollars per share)       $ 115.81    
Shares authorized and remaining under the repurchase program     14,700,000 14,700,000    
Treasury shares issued     269,646      
Treasury shares issued (usd per share)     $ 113.32      
Value of treasury shares issued     $ 31      
Subsequent Event            
Payments for Repurchase of Equity [Abstract]            
Stock repurchased, shares 300,000          
Stock repurchased, value $ 33          
Average repurchase price per share (in dollars per share) $ 129.35          
AirAsia            
Payments for Repurchase of Equity [Abstract]            
Equity interests acquired   25.00%        
Equity interests held prior to acquisition   75.00%        
Cash consideration   $ 62