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Earnings Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic and diluted earnings (loss) per share are computed by dividing Net income attributable to common stockholders by the weighted-average common shares outstanding in the period. Diluted earnings (loss) per share is computed by giving effect to all potentially dilutive securities that are outstanding.
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Basic earnings per share |  |  |  |  |
Income from continuing operations | $ | 6,427 |  |  | $ | 6,732 |  |  | $ | 8,084 |
Less: cumulative dividends on subsidiary preferred stock | (180) |  |  | (151) |  |  | (98) |
Income from continuing operations attributable to common stockholders | 6,247 |  |  | 6,581 |  |  | 7,986 |
Loss from discontinued operations, net of tax | — |  |  | — |  |  | 70 |
Net income attributable to common stockholders | $ | 6,247 |  |  | $ | 6,581 |  |  | $ | 7,916 |
Weighted-average common shares outstanding | 1,433 |  |  | 1,424 |  |  | 1,411 |
Basic earnings per common share – continuing operations | $ | 4.36 |  |  | $ | 4.62 |  |  | $ | 5.66 |
Basic loss per common share – discontinued operations | $ | — |  |  | $ | — |  |  | $ | 0.05 |
Basic earnings per common share | $ | 4.36 |  |  | $ | 4.62 |  |  | $ | 5.61 |
Diluted earnings per share |  |  |  |  |
Income from continuing operations attributable to common stockholders – diluted | $ | 6,247 |  |  | $ | 6,581 |  |  | $ | 7,986 |
Loss from discontinued operations, net of tax – diluted | $ | — |  |  | $ | — |  |  | $ | 70 |
Net income attributable to common stockholders – diluted | $ | 6,247 |  |  | $ | 6,581 |  |  | $ | 7,916 |
Weighted-average common shares outstanding – basic | 1,433 |  |  | 1,424 |  |  | 1,411 |
Dilutive effect of warrants and awards under stock incentive plans | 9 |  |  | 15 |  |  | 20 |
Weighted-average common shares outstanding – diluted | 1,442 |  |  | 1,439 |  |  | 1,431 |
Diluted earnings per common share – continuing operations | $ | 4.33 |  |  | $ | 4.57 |  |  | $ | 5.58 |
Diluted loss per common share – discontinued operations | $ | — |  |  | $ | — |  |  | $ | 0.05 |
Diluted earnings per common share | $ | 4.33 |  |  | $ | 4.57 |  |  | $ | 5.53 |
Potentially dilutive securities(a) | 7 |  |  | 7 |  |  | 9 |
__________ (a) Potentially dilutive securities attributable to outstanding stock options and RSUs were excluded from the computation of diluted EPS because the securities would have had an antidilutive effect.

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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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