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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
The following table shows our computation of basic and diluted earnings per share:
 
Year Ended December 31,
(in millions, except per share data)
2014
2013
2012
Net income
$
659

$
10,540

$
1,009

 
 
 
 
Basic weighted average shares outstanding
836

849

845

Dilutive effect of share-based awards
9

9

5

Diluted weighted average shares outstanding
845

858

850

 
 
 
 
Basic earnings per share
$
0.79

$
12.41

$
1.20

Diluted earnings per share
$
0.78

$
12.29

$
1.19