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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table shows the computation of basic and diluted earnings (loss) per share:
 
Three Months Ended June 30,
Six Months Ended June 30,
(in millions, except per share data)
2013
2012
2013
2012
Net income (loss)
$
685

$
(168
)
$
692

$
(44
)
 
 
 
 
 
Basic weighted average shares outstanding
850

845

849

844

Dilutive effect of share based awards
9

—

7

—

Diluted weighted average shares outstanding
859

845

856

844

 
 
 
 
 
Basic earnings (loss) per share
$
0.81

$
(0.20
)
$
0.81

$
(0.05
)
Diluted earnings (loss) per share
$
0.80

$
(0.20
)
$
0.81

$
(0.05
)
 
 
 
 
 
Antidilutive common stock equivalents excluded from diluted earnings per share
12

23

13

23