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Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]      
Net income $ 511 $ 453  
Total other comprehensive income (loss) 157 (4)  
Total comprehensive income 668 449  
AOCI Including Portion Attributable to Noncontrolling Interest      
Accumulated Other Comprehensive Income Loss [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (894)   $ (1,051)
Reclassification to earnings 197    
Changes in fair value (40)    
Fuel derivatives      
Accumulated Other Comprehensive Income Loss [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (1,413)   (1,666)
Reclassification to earnings 310    
Changes in fair value (57)    
Interest rate derivatives      
Accumulated Other Comprehensive Income Loss [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (34)   (30)
Reclassification to earnings 4    
Changes in fair value (8)    
Defined benefit plan items      
Accumulated Other Comprehensive Income Loss [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 22   22
Reclassification to earnings 0    
Changes in fair value 0    
Other      
Accumulated Other Comprehensive Income Loss [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 6   6
Reclassification to earnings 0    
Changes in fair value 0    
Deferred tax      
Accumulated Other Comprehensive Income Loss [Line Items]      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 525   $ 617
Reclassification to earnings (117)    
Changes in fair value 25    
Interest rate derivatives      
Accumulated Other Comprehensive Income Loss [Line Items]      
Unrealized gain (loss) on derivatives, net of tax (3) (1)  
Deferred taxes on unrealized gain (loss) on derivatives (1) 0  
Fuel derivatives      
Accumulated Other Comprehensive Income Loss [Line Items]      
Unrealized gain (loss) on derivatives, net of tax 160 (3)  
Deferred taxes on unrealized gain (loss) on derivatives $ 94 $ (1)