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Summary of Significant Accounting Policies - Chase Agreement (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share $ 0.82 $ 0.47 $ 0.34
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income $ 496 $ 293 $ 227
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results $ 544 $ 544 $ 427
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share $ 0.82 $ 0.46 $ 0.34
Passenger Revenue      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description -364 -250 -89
Special Revenue Adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description 0 0 172
Other Revenue      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description 908 794 344