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Income Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2019
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 income per common share were as follows, in millions:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Numerator (basic and diluted): |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ | 184 |  |  | $ | 170 |  |  | $ | 546 |  |  | $ | 517 |
Less: Allocation to unvested restricted stock awards | 1 |  |  | 1 |  |  | 4 |  |  | 5 |
Income from continuing operations attributable to common shareholders | 183 |  |  | 169 |  |  | 542 |  |  | 512 |
(Loss) income from discontinued operations, net | (58 | ) |  | 10 |  |  | (64 | ) |  | 23 |
Less: Allocation to unvested restricted stock awards | — |  |  | — |  |  | — |  |  | — |
(Loss) income from discontinued operations attributable to common shareholders | (58 | ) |  | 10 |  |  | (64 | ) |  | 23 |
Net income available to common shareholders | $ | 125 |  |  | $ | 179 |  |  | $ | 478 |  |  | $ | 535 |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Basic common shares (based upon weighted average) | 286 |  |  | 304 |  |  | 289 |  |  | 307 |
Add: Stock option dilution | 1 |  |  | 2 |  |  | 1 |  |  | 2 |
Diluted common shares | 287 |  |  | 306 |  |  | 290 |  |  | 309 |

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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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