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Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Schedule Of Basic And Diluted Weighted Average Common Shares Outstanding | A reconciliation of the number of shares used for the basic and diluted income (loss) per share calculations is as follows:
| Years ended December 31,
Shares in millions | 2015 |  | 2014 |  | 2013
Basic weighted average common shares outstanding | 144 |  |  | 146 |  |  | 148 |
Stock options and restricted shares | — |  |  | — |  |  | 1 |
Diluted weighted average common shares outstanding | 144 |  |  | 146 |  |  | 149 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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