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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Components of Basic and Diluted Earnings Per Share | The components of basic and diluted earnings per share are as follows:
| Three Months Ended March 31,
In millions, except per share amounts | 2015 |  | 2014
Net income available for common stockholders | $ | 22 |  |  | $ | 59 |
Weighted average outstanding shares of common stock | 145.2 |  |  | 158.4 |
Dilutive effect of employee stock options, restricted stock and other stock awards | 2.5 |  |  | 2.5 |
Common stock and common stock equivalents | 147.7 |  |  | 160.9 |
Earnings per share: |  |  |
Basic | $ | 0.15 |  |  | $ | 0.37 |
Diluted | $ | 0.15 |  |  | $ | 0.37 |

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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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