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COMPREHENSIVE INCOME (LOSS) (Tables)
3 Months Ended
Mar. 31, 2012
Notes to Financial Statements [Abstract]  
Components of comprehensive income
   Three months ended March 31,
(in millions) 2012 2011
NET INCOME $ 98 $ 5
        
Unrealized gain on fuel derivative instruments, net of      
 deferred taxes of $99 and $207   159   331
Unrealized gain on interest rate derivative instruments      
 net of deferred taxes of $4 and $4   6   7
Other, net of deferred taxes of $2 and $2   2   3
Total other comprehensive income $ 167 $ 341
        
COMPREHENSIVE INCOME $ 265 $ 346
        
        
Rollforward of the Amounts Included in AOCI, net of taxes
            Accumulated other
   Fuel  Interest rate    comprehensive
(in millions) derivatives derivatives Other income (loss)
Balance at December 31, 2011 $ (183) $ (66) $ 25 $ (224)
 Changes in fair value   136   6   2   144
 Reclassification to earnings   23         23
Balance at March 31, 2012 $ (24) $ (60) $ 27 $ (57)