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AIRTRAN ACQUISITION AND RELATED MATTERS (Tables)
12 Months Ended
Dec. 31, 2011
Notes to Financial Statements [Abstract]  
Allocation of Acquisition Price [Table Text Block]
(in millions)May 2, 2011
Assets  
 Cash and cash equivalents$ 477
 Restricted cash  6
 Other current assets  234
 Operating property and equipment  1,154
 Goodwill  970
 Other identified intangibles  125
 Deferred income taxes  160
 Other noncurrent assets  45
Liabilities  
 Long-term debt and capital leases, including current portion  (1,119)
 Air traffic liability  (354)
 Other liabilities assumed  (657)
Net assets acquired$ 1,041
Pro Forma Results of Operations [Table Text Block]
  Year ended
December 31,
(in millions, except per share data) 2011 2010
Total operating revenues $16,601 $14,721
Net income   160  499
Net income per share, basic   .21  .63
Net income per share, diluted  .21  .63