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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2013
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 |  | 2013 |  |  | 2012 |  |  | 2011 |  |  | 2013 |  |  | 2012 |  |  | 2011 |
Beginning balance at January 1 |  | $ | 12 |  |  | $ | 11 |  |  | $ | 11 |  |  | $ | 161 |  |  | $ | 129 |  |  | $ | 105 |
Capitalized |  |  | 6 |  |  |  | 6 |  |  |  | 5 |  |  |  | 72 |  |  |  | 75 |  |  |  | 63 |
Amortization |  |  | (6 | ) |  |  | (5 | ) |  |  | (5 | ) |  |  | (50 | ) |  |  | (43 | ) |  |  | (39 | )
Ending balance at December 31 |  | $ | 12 |  |  | $ | 12 |  |  | $ | 11 |  |  | $ | 183 |  |  | $ | 161 |  |  | $ | 129 |
Aggregate Amotization 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 |  | 2013 |  |  | 2014 |  |  | 2015 |  |  | 2016 |  |  | 2017 |  |  | 2018 |
Internal-use software amortization expense |  | $ | 6 |  |  | $ | 5 |  |  | $ | 4 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 0 |
External-use software amortization expense |  | $ | 50 |  |  | $ | 62 |  |  | $ | 54 |  |  | $ | 41 |  |  | $ | 21 |  |  | $ | 5 |
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 |  | 2013 |  |  | 2012 |  |  | 2011 |
Net income available for common stockholders |  | $ | 377 |  |  | $ | 419 |  |  | $ | 353 |
Weighted average outstanding shares of common stock |  |  | 163.4 |  |  |  | 168.2 |  |  |  | 168.1 |
Dilutive effect of employee stock options and restricted stock |  |  | 3.0 |  |  |  | 3.5 |  |  |  | 3.8 |
Common stock and common stock equivalents |  |  | 166.4 |  |  |  | 171.7 |  |  |  | 171.9 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.31 |  |  | $ | 2.49 |  |  | $ | 2.10 |
Diluted |  | $ | 2.27 |  |  | $ | 2.44 |  |  | $ | 2.05 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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