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QUARTERLY FINANCIAL DATA
12 Months Ended
Dec. 31, 2011
Quarterly Financial Data [Abstract]  
Quarterly Financial Information [Text Block]
QUARTERLY FINANCIAL DATA
(unaudited)

   THREE MONTHS ENDED
(in millions except per share amounts) March 31 June 30 Sept. 30 Dec. 31
2011*            
 Operating revenues $ 3,103 $ 4,136 $ 4,311 $ 4,108
 Operating income  114  207  225   147
 Income (loss) before income taxes  18  275   (226)   255
 Net income (loss)  5  161   (140)   152
 Net income (loss) per share, basic  .01  .21  (.18)  .20
 Net income (loss) per share, diluted  .01  .21  (.18)  .20
              
   March 31 June 30 Sept. 30 Dec. 31
2010            
 Operating revenues $ 2,630 $ 3,168 $ 3,192 $ 3,114
 Operating income   54  363  355  216
 Income before income taxes  17  184  332  213
 Net income  11  112  205  131
 Net income per share, basic  .01  .15  .27  .18
 Net income per share, diluted  .01  .15  .27  .18
              
*Includes the results of AirTran for May 2011 through December 2011. See Note 2 to the Consolidated Financial Statements for further information.