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Earnings Per Share Of Common Stock (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Reconciliation of basic and diluted earnings per share | The following table reconciles basic and diluted earnings (loss) per share of common stock:
(In millions, except per share amounts) |  | For the Three Months Ended June 30 |  | For the Six Months Ended June 30
Reconciliation of Basic and Diluted Earnings (Loss) per Share of Common Stock |  | 2017 |  | 2016 |  | 2017 |  | 2016
Net income (loss) |  | $ | 174 |  |  | $ | (1,089 | ) |  | $ | 379 |  |  | $ | (761 | )
Weighted average number of basic shares outstanding |  | 444 |  |  | 425 |  |  | 443 |  |  | 424 |
Assumed exercise of dilutive stock options and awards(1) |  | 1 |  |  | — |  |  | 1 |  |  | — |
Weighted average number of diluted shares outstanding |  | 445 |  |  | 425 |  |  | 444 |  |  | 424 |
Basic earnings (loss) per share of common stock |  | $ | 0.39 |  |  | $ | (2.56 | ) |  | $ | 0.86 |  |  | $ | (1.79 | )
Diluted earnings (loss) per share of common stock |  | $ | 0.39 |  |  | $ | (2.56 | ) |  | $ | 0.85 |  |  | $ | (1.79 | )
(1) | For both the three and six months ended June 30, 2017, one million shares were excluded from the calculation of diluted shares outstanding, as their inclusion would be antidilutive. For both the three and six months ended June 30, 2016, three million shares were excluded from the calculation of diluted shares outstanding, as their inclusion would be antidilutive as a result of the net loss.

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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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