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Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2016
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 June 30, |  | Six Months Ended June 30,
In millions, except per share amounts | 2016 |  | 2015 |  | 2016 |  | 2015
Net income (loss) attributable to common stockholders | $ | 64 |  |  | $ | (265 | ) |  | $ | 18 |  |  | $ | (243 | )
Weighted average outstanding shares of common stock | 129.8 |  |  | 141.9 |  |  | 129.6 |  |  | 143.6 |
Dilutive effect of employee stock options, restricted stock and other stock awards | 1.7 |  |  | — |  |  | 1.6 |  |  | — |
Common stock and common stock equivalents | 131.5 |  |  | 141.9 |  |  | 131.2 |  |  | 143.6 |
Income (loss) per share: |  |  |  |  |  |  |
Basic | $ | 0.49 |  |  | $ | (1.87 | ) |  | $ | 0.14 |  |  | $ | (1.69 | )
Diluted | $ | 0.49 |  |  | $ | (1.87 | ) |  | $ | 0.14 |  |  | $ | (1.69 | )

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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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