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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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
2018
 
2017
 
2016
Depreciation expense
$
67

 
$
55

 
$
49
Schedule Of Activities Relating To Capitalized Software
The following table identifies the activity relating to capitalized software for the following periods:
 
Internal-use Software
 
External-use Software
In millions
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Beginning balance at January 1
$
16

 
$
13

 
$
13

 
$
105

 
$
174

 
$
177

Capitalized
6

 
9

 
6

 
—

 
—

 
59

Amortization
(7
)
 
(6
)
 
(6
)
 
(48
)
 
(69
)
 
(62
)
Ending balance at December 31
$
15

 
$
16

 
$
13

 
$
57

 
$
105

 
$
174
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
2018
 
2019
 
2020
 
2021
 
2022
 
2023
Internal-use software amortization expense
$
7

 
$
6

 
$
7

 
$
7

 
$
6

 
$
6

External-use software amortization expense
$
48

 
$
34

 
$
23

 
$
—

 
$
—

 
$
—
Schedule Of Basic And Diluted Earnings Per Share
The components of basic and diluted earnings (loss) per share for the years ended December 31 are as follows: 
In millions, except earnings (loss) per share
2018
 
2017
 
2016
Net income (loss) attributable to common stockholders
$
30

 
$
(67
)
 
$
125

Weighted average outstanding shares of common stock
119.2

 
125.8

 
129.7

Dilutive effect of employee stock options, restricted shares and other stock awards
2.0

 
—

 
1.8

Common stock and common stock equivalents
121.2

 
125.8

 
131.5

Earnings (loss) per share:
 
 
 
 
 
Basic
$
0.25

 
$
(0.53
)
 
$
0.96

Diluted
$
0.25

 
$
(0.53
)
 
$
0.95