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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2017
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) | 2017 | 2016 | 2015
Earnings |  |  |
(Loss) income from continuing operations, net of tax | $ | (262 | ) | $ | 613 |  | $ | 1,189 |
(Loss) income from discontinued operations, net of tax | (2,869 | ) | 283 |  | 493 |
Net (loss) income | $ | (3,131 | ) | $ | 896 |  | $ | 1,682 |
Shares |  |  |  |  |  |
Weighted average common shares outstanding, basic | 363.7 |  | 387.7 |  | 415.5 |
Dilutive effect of warrants | — |  | 3.6 |  | 4.7 |
Dilutive effect of stock-based awards under compensation plans | — |  | 3.5 |  | 5.0 |
Weighted average shares outstanding and dilutive potential common shares [1] | 363.7 |  | 394.8 |  | 425.2 |
Net income per common share |  |  |
Basic |  |  |
(Loss) income from continuing operations, net of tax | $ | (0.72 | ) | $ | 1.58 |  | $ | 2.86 |
(Loss) income from discontinued operations, net of tax | (7.89 | ) | 0.73 |  | 1.19 |
Net income per common share | $ | (8.61 | ) | $ | 2.31 |  | $ | 4.05 |
Diluted |  |  |  |  |  |
(Loss) income from continuing operations, net of tax | $ | (0.72 | ) | $ | 1.55 |  | $ | 2.80 |
(Loss) income from discontinued operations, net of tax | (7.89 | ) | 0.72 |  | 1.16 |
Net (loss) income per common share | $ | (8.61 | ) | $ | 2.27 |  | $ | 3.96 |
[1] | For additional information, see Note 15 - Equity and Note 19 - Stock Compensation Plans of Notes to Consolidated Financial Statements.

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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