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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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