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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings (Loss) Per Common Share | Computation of Basic and Diluted Earnings per Common Share
| For the years ended December 31,
(In millions, except for per share data) | 2020 | 2019 | 2018
Earnings |  |  |
Income from continuing operations, net of tax | $ | 1,737 |  | $ | 2,085 |  | $ | 1,485 |
Less: Preferred stock dividends | 21 |  | 21 |  | 6 |
Income from continuing operations, net of tax, available to common stockholders | 1,716 |  | 2,064 |  | 1,479 |
Income from discontinued operations, net of tax, available to common stockholders | — |  | — |  | 322 |
Net income available to common stockholders | $ | 1,716 |  | $ | 2,064 |  | $ | 1,801 |
Shares |  |  |
Weighted average common shares outstanding, basic | 358.3 |  | 360.9 |  | 358.4 |
Dilutive effect of warrants [1] | — |  | 0.5 |  | 1.9 |
Dilutive effect of stock-based awards under compensation plans | 2.3 |  | 3.5 |  | 3.8 |
Weighted average common shares outstanding and dilutive potential common shares [2] | 360.6 |  | 364.9 |  | 364.1 |
Earnings per common share |  |  |
Basic |  |  |
Income from continuing operations, net of tax, available to common stockholders | $ | 4.79 |  | $ | 5.72 |  | $ | 4.13 |
Income from discontinued operations, net of tax, available to common stockholders | — |  | — |  | 0.90 |
Net income available to common stockholders | $ | 4.79 |  | $ | 5.72 |  | $ | 5.03 |
Diluted |  |  |
Income from continuing operations, net of tax, available to common stockholders | $ | 4.76 |  | $ | 5.66 |  | $ | 4.06 |
Income from discontinued operations, net of tax, available to common stockholders | — |  | — |  | 0.89 |
Net income available to common stockholders | $ | 4.76 |  | $ | 5.66 |  | $ | 4.95 |
[1]On June 26, 2019 the Capital Purchase Program warrants issued in 2009 expired. [2]For additional information, see Note 16 - Equity and Note 20 - Stock Compensation Plans.

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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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