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Earnings (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2011
Earnings (Loss) Per Share (Tables) [Abstract]  
Computation of basic and diluted earnings (loss) per share
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)
2011
2010
2011
2010
Net income (loss)
$
198


$
467


$
(120
)
$
211


 
 
 
 
 
Basic weighted average shares outstanding
838


834


838


833


Dilutive effects of share based awards
6
8
—


9
Diluted weighted average shares outstanding
844
842
838
842
 
 
 
 
 
Basic earnings (loss) per share
$
0.24


$
0.56


$
(0.14
)
$
0.25


Diluted earnings (loss) per share
$
0.23


$
0.55


$
(0.14
)
$
0.25


 
 
 
 
 
Antidilutive common stock equivalents excluded from diluted earnings (loss) per share
25
23
31
22