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Contingencies - Antitrust Litigation and Investigations (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2019
Dec. 31, 2016
Sep. 30, 2019
Aug. 20, 2019
Loss Contingencies [Line Items]              
VAT receivables       $ 21,000,000   $ 21,000,000  
Foreign Tax Authority | Indian Income Tax Litigation              
Loss Contingencies [Line Items]              
Taxes, interest and penalties           43,000,000  
US Airways Litigation              
Loss Contingencies [Line Items]              
Damages awarded $ 15,000,000       $ 15,000,000    
Loss contingency accrual     $ 32,000,000 0 32,000,000 0  
Reasonable attorneys' fees, expenses and costs         $ 17,000,000    
Accrued loss reversal       $ 32,000,000      
Department Of Justice Lawsuit              
Loss Contingencies [Line Items]              
Advanced attorneys' fees incurred           $ 16,000,000  
Department Of Justice Lawsuit | Maximum              
Loss Contingencies [Line Items]              
Termination fee             $ 30,000,000
US Airways | US Airways Litigation              
Loss Contingencies [Line Items]              
Damages awarded   $ 15,000,000 $ 5,000,000        
Attorneys' fees and costs sought   $ 125,000,000