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Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accumulated Other Comprehensive Income Loss [Line Items]        
Net income $ 329 $ 259 $ 946 $ 542
Other, net of deferred taxes 1 3 4 4
Total other comprehensive income (loss) (203) 134 (89) 5
Total comprehensive income 126 393 857 547
Deferred taxes on unrealized gain (loss) on other 1 2 4 6
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
AOCI Beginning Balance     (3)  
AOCI Ending Balance (92)   (92)  
Fuel derivatives
        
Accumulated Other Comprehensive Income Loss [Line Items]        
Unrealized gain (loss) on derivatives, net of tax (210) 129 (101) (25)
Deferred taxes on unrealized gain (loss) on derivatives (124) 76 (60) (16)
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
Reclassification to earnings 6   4  
AOCI Beginning Balance 153   (20)  
Changes in fair value (340)   (165)  
AOCI Ending Balance (181)   (181)  
Interest rate derivatives
        
Accumulated Other Comprehensive Income Loss [Line Items]        
Unrealized gain (loss) on derivatives, net of tax 6 2 8 26
Deferred taxes on unrealized gain (loss) on derivatives 3 2 4 16
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
Reclassification to earnings 6   17  
AOCI Beginning Balance (55)   (58)  
Changes in fair value 3   (5)  
AOCI Ending Balance (46)   (46)  
Defined benefit plan items
        
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
Reclassification to earnings 0   0  
AOCI Beginning Balance 65   65  
Changes in fair value 0   0  
AOCI Ending Balance 65   65  
Other
        
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
Reclassification to earnings 0   0  
AOCI Beginning Balance 14   8  
Changes in fair value 2   8  
AOCI Ending Balance 16   16  
Deferred tax
        
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
Reclassification to earnings (4)   (8)  
AOCI Beginning Balance (66)   2  
Changes in fair value 124   60  
AOCI Ending Balance 54   54  
Accumulated other comprehensive income (loss)
        
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
Reclassification to earnings 8   13  
AOCI Beginning Balance 111   (3)  
Changes in fair value (211)   (102)  
AOCI Ending Balance $ (92)   $ (92)