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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2016
Earnings Per Share [Abstract] |
Schedule of reconciliations of the numerators and denominators used in the 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:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Numerator (basic and diluted): |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ | 150 |  |  | $ | 109 |  |  | $ | 259 |  |  | $ | 170 |
Less: Allocation to unvested restricted stock awards | 2 |  |  | 1 |  |  | 3 |  |  | 2 |
Income from continuing operations attributable to common shareholders | 148 |  |  | 108 |  |  | 256 |  |  | 168 |
Loss from discontinued operations, net | — |  |  | (4 | ) |  | — |  |  | (1 | )
Less: Allocation to unvested restricted stock awards | — |  |  | — |  |  | — |  |  | — |
Loss from discontinued operations attributable to common shareholders | — |  |  | (4 | ) |  | — |  |  | (1 | )
Net income available to common shareholders | $ | 148 |  |  | $ | 104 |  |  | $ | 256 |  |  | $ | 167 |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Basic common shares (based upon weighted average) | 328 |  |  | 340 |  |  | 329 |  |  | 342 |
Add: Stock option dilution | 3 |  |  | 4 |  |  | 4 |  |  | 4 |
Diluted common shares | 331 |  |  | 344 |  |  | 333 |  |  | 346 |

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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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