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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
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
2015
 
2014
 
2013
Depreciation expense
$
53

 
$
51

 
$
48
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
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Beginning balance at January 1
$
13

 
$
12

 
$
12

 
$
186

 
$
183

 
$
161

Capitalized
6

 
7

 
6

 
61

 
68

 
72

Amortization
(6
)
 
(6
)
 
(6
)
 
(70
)
 
(65
)
 
(50
)
Ending balance at December 31
$
13

 
$
13

 
$
12

 
$
177

 
$
186

 
$
183
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
2015
 
2016
 
2017
 
2018
 
2019
 
2020
Internal-use software amortization expense
$
6

 
$
6

 
$
4

 
$
3

 
$
—

 
$
—

External-use software amortization expense
$
70

 
$
66

 
$
56

 
$
36

 
$
19

 
$
—
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
2015
 
2014
 
2013
Net (loss) income attributable to common stockholders
$
(214
)
 
$
367

 
$
377

Weighted average outstanding shares of common stock
139.6

 
155.3

 
163.4

Dilutive effect of employee stock options, restricted shares and other stock awards
—

 
2.5

 
3.0

Common stock and common stock equivalents
139.6

 
157.8

 
166.4

(Loss) earnings per share:
 
 
 
 
 
Basic
$
(1.53
)
 
$
2.36

 
$
2.31

Diluted
$
(1.53
)
 
$
2.33

 
$
2.27