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Earnings Per Share
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Earnings Per Share
EARNINGS PER SHARE

We calculate basic earnings per share by dividing the net income by the weighted average number of common shares outstanding, excluding restricted shares. Antidilutive common stock equivalents excluded from the diluted earnings per share calculation are not material. 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