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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Reconciliation of the Earnings (Losses) and Number of Shares Used in Calculations of Basic and Diluted Earnings Per Share
The table below illustrates the reconciliation of the earnings and number of shares used in our calculations of basic and diluted earnings per share:
 
Three Months Ended
 
Nine Months Ended
(in millions, except per share amounts)
September 30, 2015
 
September 30, 2014
 
September 30, 2015
 
September 30, 2014
Computation of Basic Earnings Per Share
 
 
 
 
 
 
 
Net income
$
210

 
$
192

 
$
657

 
$
556

Weighted average shares outstanding
262.2

 
288.9

 
270.7

 
292.5

Basic earnings per share
$
0.80

 
$
0.66

 
$
2.43

 
$
1.90

Computation of Diluted Earnings Per Share
 
 
 
 
 
 
 
Net income
$
210

 
$
192

 
$
657

 
$
556

Weighted average shares outstanding
262.2

 
288.9

 
270.7

 
292.5

Effect of dilutive securities
 
 
 
 
 
 
 
Employee stock option and appreciation right plans
2.2

 
2.9

 
2.3

 
3.2

Deferred stock incentive plans
0.6

 
0.7

 
0.6

 
0.7

Restricted stock units
2.3

 
2.9

 
2.5

 
3.0

Shares for diluted earnings per share
267.3

 
295.4

 
276.1

 
299.4

Diluted earnings per share
$
0.78

 
$
0.65

 
$
2.38

 
$
1.86