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INCOME PER COMMON SHARE | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
INCOME PER COMMON SHARE | INCOME 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:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Numerator (basic and diluted): |  |  |  |  |
Income from continuing operations | $ | 844 |  |  | $ | 410 |  |  | $ | 810 |
Less: Allocation to redeemable noncontrolling interest | (2) |  |  | 2 |  |  | — |
Less: Allocation to unvested restricted stock awards | 4 |  |  | 2 |  |  | 6 |
Income from continuing operations attributable to common shareholders | 842 |  |  | 406 |  |  | 804 |
Income from discontinued operations, net | — |  |  | — |  |  | 414 |
Less: Allocation to unvested restricted stock awards | — |  |  | — |  |  | 3 |
Income from discontinued operations, net attributable to common shareholders | — |  |  | — |  |  | 411 |
Net income attributable to common shareholders | $ | 842 |  |  | $ | 406 |  |  | $ | 1,215 |
Denominator: |  |  |  |  |
Basic common shares (based upon weighted average) | 231 |  |  | 249 |  |  | 264 |
Add: Stock option dilution | 1 |  |  | 2 |  |  | — |
Diluted common shares | 232 |  |  | 251 |  |  | 264 |
We follow accounting guidance regarding determining whether instruments granted in share-based payment transactions are participating securities. This accounting guidance clarifies that share-based payment awards that entitle their holders to receive non-forfeitable dividends prior to vesting should be considered participating securities. The dividends associated with the unvested restricted stock units are forfeitable, and consequently, the restricted stock units are not considered a participating security and are not accounted for under the two-class method. We have also granted restricted stock awards that contain non-forfeitable rights to dividends on unvested shares; such unvested restricted stock awards are considered participating securities. As participating securities, the unvested shares are required to be included in the calculation of our basic income per common share, using the two-class method. The two-class method of computing income per common share is an allocation method that calculates income per share for each class of common stock and participating security according to dividends declared and participation rights in undistributed earnings. For the years ended December 31, 2022, 2021 and 2020, we allocated dividends and undistributed earnings to the participating securities. The following stock options, restricted stock units and performance restricted stock units were excluded from the computation of weighted-average diluted common shares outstanding due to their anti-dilutive effect, in thousands:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Number of stock options | 635 |  | 296 |  | 374
Number of restricted stock units | 20 |  | — |  |  | — |
Number of performance restricted stock units | 15 |  | — |  |  | — |
INCOME PER COMMON SHARE (Concluded)Common shares outstanding included on our balance sheet and for the calculation of income per common share do not include unvested stock awards (273,000 and 608,000 common shares at December 31, 2022 and 2021, respectively); shares outstanding for legal requirements included all common shares that have voting rights (including unvested stock awards).

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI https://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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