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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
Three Months Ended
(in millions, except per share data)
March 31
June 30(1)
September 30(2)(3)
December 31(2)
2011
 
 
 
 
Operating revenue
$
7,747

$
9,153

$
9,816

$
8,399

Operating income (loss)
(92
)
481

860

726

Net income (loss)
(318
)
198

549

425

Basic earnings (loss) per share
(0.38
)
0.24

0.66

0.51

Diluted earnings (loss) per share
(0.38
)
0.23

0.65

0.50

2010
 
 
 
 
Operating revenue
$
6,848

$
8,168

$
8,950

$
7,789

Operating income
68

852

1,003

294

Net income (loss)
(256
)
467

363

19

Basic earnings (loss) per share
(0.31
)
0.56

0.43

0.02

Diluted earnings (loss) per share
(0.31
)
0.55

0.43

0.02


(1) 
During the June 2011 quarter, we recorded $144 million of charges related to severance and related costs and our facilities consolidation and fleet assessments.
(2) 
During the September 2011 quarter, we recorded $208 million of fuel hedge losses for mark-to-market adjustments recorded in periods other than the settlement period and in the December 2011 quarter, we recorded $164 million of fuel hedge gains for mark-to-market adjustments recorded in periods other than the settlement period.
(3) 
During the September 2010 quarter, we recorded (1) a $360 million loss associated with the primarily non-cash loss on extinguishment of debt, including the write-off of unamortized debt discount and (2) a $146 million charge related to the Comair fleet reduction initiative.