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(Loss) Income Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2021
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 (loss) income per common share were as follows, in millions:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Numerator (basic and diluted): |  |  |  |  |  |  |
(Loss) income from continuing operations | $ | (36) |  |  | $ | 210 |  |  | $ | 58 |  |  | $ | 343 |
Less: Allocation to redeemable noncontrolling interest | — |  |  | — |  |  | 6 |  |  | — |
Less: Allocation to unvested restricted stock awards | — |  |  | 2 |  |  | — |  |  | 3 |
(Loss) income from continuing operations attributable to common shareholders | (36) |  |  | 208 |  |  | 52 |  |  | 340 |
Income from discontinued operations, net | — |  |  | 14 |  |  | — |  |  | 411 |
Less: Allocation to unvested restricted stock awards | — |  |  | — |  |  | — |  |  | 3 |
Income from discontinued operations, net attributable to common shareholders | — |  |  | 14 |  |  | — |  |  | 408 |
Net (loss) income attributable to common shareholders | $ | (36) |  |  | $ | 222 |  |  | $ | 52 |  |  | $ | 748 |
Denominator: |  |  |  |  |  |  |
Basic common shares (based upon weighted average) | 252 |  |  | 262 |  |  | 254 |  |  | 267 |
Add: Stock option dilution | — |  |  | 1 |  |  | 2 |  |  | 1 |
Diluted common shares | 252 |  |  | 263 |  |  | 256 |  |  | 268 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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