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QUARTERLY FINANCIAL DATA
12 Months Ended
Dec. 31, 2012
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
2012            
 Operating revenues $ 3,991 $ 4,616 $ 4,309 $ 4,173
 Operating income  22  460  51   91
 Income before income taxes  159  368   33   125
 Net income   98  228   16   78
 Net income per share, basic  .13  .30  .02  .11
 Net income per share, diluted  .13  .30  .02  .11
              
   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
              
*Includes the results of AirTran for May 2011 through December 2011. See Note 2 to the Consolidated Financial Statements for further information.