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EARNINGS PER COMMON SHARE (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
| 2017 |  | 2016 |  | 2015
Numerator (basic and diluted): |  |  |  |  |
Income from continuing operations | $ | 533 |  |  | $ | 491 |  |  | $ | 357 |
Less: Allocation to unvested restricted stock awards | 5 |  |  | 6 |  |  | 5 |
Income from continuing operations attributable to common shareholders | 528 |  |  | 485 |  |  | 352 |
Loss from discontinued operations, net | — |  |  | — |  |  | (2 | )
Less: Allocation to unvested restricted stock awards | — |  |  | — |  |  | — |
Loss from discontinued operations attributable to common shareholders | — |  |  | — |  |  | (2 | )
Net income available to common shareholders | $ | 528 |  |  | $ | 485 |  |  | $ | 350 |
Denominator: |  |  |  |  |
Basic common shares (based upon weighted average) | 314 |  |  | 326 |  |  | 338 |
Add: Stock option dilution | 4 |  |  | 4 |  |  | 3 |
Diluted common shares | 318 |  |  | 330 |  |  | 341 |

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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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