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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Fuel and oil $ 3,940 $ 3,647 $ 3,616
Interest Expense 114 122 121
Balance at end of period 12 (323)  
Fuel derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 3 (499) (1,666)
Changes in fair value (50) 194  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   973  
Interest rate derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (7) (18) (30)
Changes in fair value 0 (3)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   15  
Defined benefit plan items      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (9) (14) 22
Changes in fair value 5 (36)  
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 33 20 6
Changes in fair value 13 14  
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 (8) 188 617
Changes in fair value 11 (63)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (207) (366)  
Accumulated other comprehensive income (loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 12 (323) $ (1,051)
Changes in fair value (21) 106  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 356 $ 622  
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Fuel and oil 552    
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Interest Expense $ 11