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Income Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 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 income per common share were as follows, in millions:
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Numerator (basic and diluted): |  |  |  |  |  |  |
Income from continuing operations | $ | 210 |  |  | $ | 211 |  |  | $ | 343 |  |  | $ | 318 |
Less: Allocation to unvested restricted stock awards | 2 |  |  | 2 |  |  | 3 |  |  | 2 |
Income from continuing operations attributable to common shareholders | 208 |  |  | 209 |  |  | 340 |  |  | 316 |
Income from discontinued operations, net | 14 |  |  | 29 |  |  | 411 |  |  | 38 |
Less: Allocation to unvested restricted stock awards | — |  |  | — |  |  | 3 |  |  | — |
Income from discontinued operations, net attributable to common shareholders | 14 |  |  | 29 |  |  | 408 |  |  | 38 |
Net income attributable to common shareholders | $ | 222 |  |  | $ | 238 |  |  | $ | 748 |  |  | $ | 354 |
Denominator: |  |  |  |  |  |  |
Basic common shares (based upon weighted average) | 262 |  |  | 289 |  |  | 267 |  |  | 291 |
Add: Stock option dilution | 1 |  |  | 1 |  |  | 1 |  |  | 1 |
Diluted common shares | 263 |  |  | 290 |  |  | 268 |  |  | 292 |

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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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