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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Fuel and oil $ 3,647 $ 3,616 $ 5,293
Interest Expense 122 121 130
Balance at end of period (323) (1,051)  
Fuel derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (499) (1,666) (1,177)
Changes in fair value 194 (867)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   378  
Interest rate derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (18) (30) (45)
Changes in fair value (3) (5)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   20  
Defined benefit plan items      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (14) 22 41
Changes in fair value (36) (19)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0  
Other      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 20 6 8
Changes in fair value 14 (2)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0  
Deferred tax      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 188 617 435
Changes in fair value (63) 329  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (366) (147)  
Accumulated other comprehensive income (loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (323) (1,051) $ (738)
Changes in fair value 106 (564)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 622 $ 251  
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Fuel and oil 973    
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Interest Expense $ 15