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Income Per Common Share | 3 Months Ended
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Mar. 31, 2021
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 income per common share were as follows, in millions:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
Numerator (basic and diluted): |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  | $ | 94 |  |  | $ | 133 |
Less: Allocation to redeemable noncontrolling interest |  |  |  |  | 6 |  |  | — |
Less: Allocation to unvested restricted stock awards |  |  |  |  | — |  |  | 1 |
Income from continuing operations attributable to common shareholders |  |  |  |  | 88 |  |  | 132 |
Income from discontinued operations, net |  |  |  |  | — |  |  | 397 |
Less: Allocation to unvested restricted stock awards |  |  |  |  | — |  |  | 3 |
Income from discontinued operations, net attributable to common shareholders |  |  |  |  | — |  |  | 394 |
Net income attributable to common shareholders |  |  |  |  | $ | 88 |  |  | $ | 526 |
Denominator: |  |  |  |  |  |  |
Basic common shares (based upon weighted average) |  |  |  |  | 256 |  |  | 273 |
Add: Stock option dilution |  |  |  |  | 1 |  |  | 1 |
Diluted common shares |  |  |  |  | 257 |  |  | 274 |
For the three-month period ended March 31, 2021, we allocated undistributed earnings to the unvested restricted stock awards. For the three-month period ended March 31, 2020, we allocated dividends and undistributed earnings to the unvested restricted stock awards. Additionally, 188,000 and 582,000 common shares for the three-month periods ended March 31, 2021 and 2020, respectively, related to stock options, and 7,000 restricted stock units for the three-month period ended March 31, 2020 were excluded from the computation of diluted income per common share due to their antidilutive effect. Effective February 10, 2021, our Board of Directors authorized the repurchase, for retirement, of up to $2.0 billion of shares of our common stock in open-market transactions or otherwise, replacing the previous Board of Directors authorization established in 2019. In the first three months of 2021, we repurchased and retired 5.5 million shares of our common stock (including 0.6 million shares to offset the dilutive impact of restricted stock units granted in the first three months of the year), for approximately $303 million. At March 31, 2021, we had $1.9 billion remaining under the 2021 authorization. On the basis of amounts paid (declared), cash dividends per common share were $0.140 for the three-month period ended March 31, 2021 and $0.135 ($0.135) for the three-month period ended March 31, 2020, respectively.

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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 http://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 http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://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 http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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