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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
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
2016
 
2015
 
2014
Depreciation expense
$
49

 
$
53

 
$
51
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
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Beginning balance at January 1
$
13

 
$
13

 
$
12

 
$
177

 
$
186

 
$
183

Capitalized
6

 
6

 
7

 
59

 
61

 
68

Amortization
(6
)
 
(6
)
 
(6
)
 
(62
)
 
(70
)
 
(65
)
Ending balance at December 31
$
13

 
$
13

 
$
13

 
$
174

 
$
177

 
$
186
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 years ended (estimated)
In millions
2016
 
2017
 
2018
 
2019
 
2020
 
2021
Internal-use software amortization expense
$
6

 
$
6

 
$
4

 
$
3

 
$
—

 
$
—

External-use software amortization expense
$
62

 
$
68

 
$
49

 
$
34

 
$
23

 
$
—
Schedule Of Basic And Diluted Earnings Per Share
The components of basic and diluted earnings (loss) per share are as follows: 
 
For the years ended December 31
In millions, except earnings (loss) per share
2016
 
2015
 
2014
Net income (loss) attributable to common stockholders
$
125

 
$
(214
)
 
$
367

Weighted average outstanding shares of common stock
129.7

 
139.6

 
155.3

Dilutive effect of employee stock options, restricted shares and other stock awards
1.8

 
—

 
2.5

Common stock and common stock equivalents
131.5

 
139.6

 
157.8

Earnings (loss) per share:
 
 
 
 
 
Basic
$
0.96

 
$
(1.53
)
 
$
2.36

Diluted
$
0.95

 
$
(1.53
)
 
$
2.33