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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
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 |  | 2012 |  |  | 2011 |  |  | 2010 |  |  | 2012 |  |  | 2011 |  |  | 2010 |
Beginning balance at January 1 |  | $ | 11 |  |  | $ | 11 |  |  | $ | 12 |  |  | $ | 129 |  |  | $ | 105 |  |  | $ | 90 |
Capitalized |  |  | 6 |  |  |  | 5 |  |  |  | 5 |  |  |  | 75 |  |  |  | 63 |  |  |  | 44 |
Amortization |  |  | (5 | ) |  |  | (5 | ) |  |  | (6 | ) |  |  | (43 | ) |  |  | (39 | ) |  |  | (29 | )
Ending balance at December 31 |  | $ | 12 |  |  | $ | 11 |  |  | $ | 11 |  |  | $ | 161 |  |  | $ | 129 |  |  | $ | 105 |
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 |  | 2012 |  |  | 2011 |  |  | 2010 |
Net income available for common stockholders |  | $ | 419 |  |  | $ | 353 |  |  | $ | 301 |
Weighted average outstanding shares of common stock |  |  | 168.2 |  |  |  | 168.1 |  |  |  | 167.4 |
Dilutive effect of employee stock options and restricted stock |  |  | 3.5 |  |  |  | 3.8 |  |  |  | 3.0 |
Common stock and common stock equivalents |  |  | 171.7 |  |  |  | 171.9 |  |  |  | 170.4 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.49 |  |  | $ | 2.10 |  |  | $ | 1.80 |
Diluted |  | $ | 2.44 |  |  | $ | 2.05 |  |  | $ | 1.77 |

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