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Quarterly Financial Data (Unaudited) (Notes)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Data [Abstract]  
Quarterly Financial Information [Text Block]
QUARTERLY FINANCIAL DATA (UNAUDITED)

The following table summarizes our unaudited results of operations on a quarterly basis. The quarterly earnings (loss) per share amounts for a year will not add to the earnings per share for that year due to the weighting of shares used in calculating per share data.
 
Three Months Ended
(in millions, except per share data)
March 31
June 30
September 30
December 31
2012
 
 
 
 
Operating revenue
$
8,413

$
9,732

$
9,923

$
8,602

Operating income
382

134

1,308

352

Net income (loss)
124

(168
)
1,047

7

Basic earnings (loss) per share
$
0.15

$
(0.20
)
$
1.24

$
0.01

Diluted earnings (loss) per share
$
0.15

$
(0.20
)
$
1.23

$
0.01

2011
 
 
 
 
Operating revenue
$
7,747

$
9,153

$
9,816

$
8,399

Operating (loss) income
(92
)
481

860

726

Net (loss) income
(318
)
198

549

425

Basic (loss) earnings per share
$
(0.38
)
$
0.24

$
0.66

$
0.51

Diluted (loss) earnings per share
$
(0.38
)
$
0.23

$
0.65

$
0.50



The following are included in the results above:
 
Three Months Ended
(in millions)
March 31
June 30
September 30
December 31
2012
 
 
 
 
Severance and related cost
$
—

$
(171
)
$
(66
)
$
—

Facilities, fleet and other
(27
)
(22
)
(122
)
(122
)
Gain on slot exchange
39

—

39

—

Loss on extinguishment of debt
—

—

(12
)
(106
)
MTM adjustments
151

(561
)
440

(3
)
Total income (loss)
$
163

$
(754
)
$
279

$
(231
)
 
 
 
 
 
2011


 




Severance and related cost
$
—

$
(80
)
$
(3
)
$
(52
)
Facilities, fleet and other
(7
)
(64
)
—

(29
)
Intangible asset impairment
—

—

—

(50
)
Gain on divestiture of slots
—

—

—

43

Loss on extinguishment of debt
(20
)
(13
)
(5
)
(30
)
MTM adjustments
29

(11
)
(208
)
164

Total income (loss)
$
2

$
(168
)
$
(216
)
$
46