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INCOME PER COMMON SHARE (Tables) | 12 Months Ended
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Dec. 31, 2020
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:
| 2020 |  | 2019 |  | 2018
Numerator (basic and diluted): |  |  |  |  |
Income from continuing operations | $ | 810 |  |  | $ | 639 |  |  | $ | 636 |
Less: Allocation to unvested restricted stock awards | 6 |  |  | 4 |  |  | 6 |
Income from continuing operations attributable to common shareholders | 804 |  |  | 635 |  |  | 630 |
Income from discontinued operations, net | 414 |  |  | 296 |  |  | 98 |
Less: Allocation to unvested restricted stock awards | 3 |  |  | 2 |  |  | 1 |
Income from discontinued operations, net attributable to common shareholders | 411 |  |  | 294 |  |  | 97 |
Net income attributable to common shareholders | $ | 1,215 |  |  | $ | 929 |  |  | $ | 727 |
Denominator: |  |  |  |  |
Basic common shares (based upon weighted average) | 264 |  |  | 287 |  |  | 305 |
Add: Stock option dilution | — |  |  | 1 |  |  | 2 |
Diluted common shares | 264 |  |  | 288 |  |  | 307 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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