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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Description of Business, Basis of Presentation and Significant Accounting Policies [Abstract]  
Schedule Of Depreciation Expense
Total depreciation expense on the Company’s property and equipment for December 31 was as follows:
In millions
2014
 
2013
 
2012
Depreciation expense
$
51

 
$
48

 
$
41
Schedule Of Activities Relating To Capitalized Software
The following table identifies the activity relating to capitalized software:
 
Internal-use Software
 
External-use Software
In millions
2014
 
2013
 
2012
 
2014
 
2013
 
2012
Beginning balance at January 1
$
12

 
$
12

 
$
11

 
$
183

 
$
161

 
$
129

Capitalized
7

 
6

 
6

 
68

 
72

 
75

Amortization
(6
)
 
(6
)
 
(5
)
 
(65
)
 
(50
)
 
(43
)
Ending balance at December 31
$
13

 
$
12

 
$
12

 
$
186

 
$
183

 
$
161
Aggregate Amortization Expense for Internal and External-Use Software
The aggregate amortization expense (actual and estimated) for internal-use and external-use software for the following periods is:
 
Actual
 
For the year ended (estimated)
In millions
2014
 
2015
 
2016
 
2017
 
2018
 
2019
Internal-use software amortization expense
$
6

 
$
5

 
$
4

 
$
3

 
$
1

 
$
—

External-use software amortization expense
$
65

 
$
67

 
$
55

 
$
38

 
$
20

 
$
6
Schedule Of Basic And Diluted Earnings Per Share
The components of basic and diluted earnings per share are as follows: 
 
For the year ended December 31
In millions, except earnings per share
2014
 
2013
 
2012
Net income available for common stockholders
$
367

 
$
377

 
$
419

Weighted average outstanding shares of common stock
155.3

 
163.4

 
168.2

Dilutive effect of employee stock options and restricted stock
2.5

 
3.0

 
3.5

Common stock and common stock equivalents
157.8

 
166.4

 
171.7

Earnings per share:
 
 
 
 
 
Basic
$
2.36

 
$
2.31

 
$
2.49

Diluted
$
2.33

 
$
2.27

 
$
2.44