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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
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 | 2019 |  | 2018 |  | 2017
Depreciation expense | $ | 104 |  |  | $ | 67 |  |  | $ | 55 |
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 | 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Beginning balance at January 1 | $ | 15 |  |  | $ | 16 |  |  | $ | 13 |  |  | $ | 57 |  |  | $ | 105 |  |  | $ | 174 |
Capitalized | 5 |  |  | 6 |  |  | 9 |  |  | — |  |  | — |  |  | — |
Amortization | (7 | ) |  | (7 | ) |  | (6 | ) |  | (34 | ) |  | (48 | ) |  | (69 | )
Ending balance at December 31 | $ | 13 |  |  | $ | 15 |  |  | $ | 16 |  |  | $ | 23 |  |  | $ | 57 |  |  | $ | 105 |
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 | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024
Internal-use software amortization expense | $ | 7 |  |  | $ | 7 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 6 |
External-use software amortization expense | $ | 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 | 2019 |  | 2018 |  | 2017
Net (loss) income attributable to common stockholders | $ | (20 | ) |  | $ | 30 |  |  | $ | (67 | )
Weighted average outstanding shares of common stock | 114.2 |  |  | 119.2 |  |  | 125.8 |
Dilutive effect of employee stock options, restricted shares and other stock awards | — |  |  | 2.0 |  |  | — |
Common stock and common stock equivalents | 114.2 |  |  | 121.2 |  |  | 125.8 |
(Loss) earnings per share: |  |  |  |  |
Basic | $ | (0.18 | ) |  | $ | 0.25 |  |  | $ | (0.53 | )
Diluted | $ | (0.18 | ) |  | $ | 0.25 |  |  | $ | (0.53 | )

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