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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Numerators and Denominators Used in Computations of Basic and Diluted Earnings Per Common Share | Reconciliations of the numerators and denominators used in the computations of basic and diluted earnings per common share were as follows, in millions:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator (basic and diluted): |  |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations |  | $ | (76 | ) |  | $ | (465 | ) |  | $ | (1,022 | )
Allocation to unvested restricted stock awards |  |  | (2 | ) |  |  | (3 | ) |  |  | (3 | )
Loss from continuing operations attributable to common shareholders |  |  | (78 | ) |  |  | (468 | ) |  |  | (1,025 | )
Loss from discontinued operations, net |  |  | (38 | ) |  |  | (110 | ) |  |  | (21 | )
Net loss available to common shareholders |  | $ | (116 | ) |  | $ | (578 | ) |  | $ | (1,046 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic common shares (based on weighted average) |  |  | 349 |  |  |  | 348 |  |  |  | 349 |
Add: |  |  |  |  |  |  |  |  |  |  |  |
Contingent common shares |  |  | — |  |  |  | — |  |  |  | — |
Stock option dilution |  |  | — |  |  |  | — |  |  |  | — |
Diluted common shares |  |  | 349 |  |  |  | 348 |  |  |  | 349 |

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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