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Earnings (Loss) Per Common Share Level 1 (Notes) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] |
Computation of Basic and Diluted Earnings (Loss) per Common Share
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions, except for per share data) | 2017 | 2016 |  | 2017 | 2016
Earnings |  |  |  |  |
Net income (loss) | $ | (40 | ) | $ | 216 |  |  | $ | 338 |  | $ | 539 |
Shares |  |  |  |  |
Weighted average common shares outstanding, basic | 366.0 |  | 391.8 |  |  | 368.7 |  | 395.2 |
Dilutive effect of stock compensation plans | — |  | 3.2 |  |  | 4.0 |  | 3.6 |
Dilutive effect of warrants | — |  | 3.6 |  |  | 2.8 |  | 3.6 |
Weighted average common shares outstanding and dilutive potential common shares | 366.0 |  | 398.6 |  |  | 375.5 |  | 402.4 |
Net income (loss) per common share |  |  |  |  |
Basic | $ | (0.11 | ) | $ | 0.55 |  |  | $ | 0.92 |  | $ | 1.36 |
Diluted | $ | (0.11 | ) | $ | 0.54 |  |  | $ | 0.90 |  | $ | 1.34 |
As a result of the net loss for three months ended June 30, 2017, the Company was required to use basic weighted average common shares outstanding in the calculation of diluted loss per share, since the inclusion of 3.8 million shares for stock compensation plans and 2.5 million shares for warrants would have been antidilutive to the earnings (loss) per share calculation. In the absence of the net loss, weighted average common shares outstanding and dilutive potential common shares would have totaled 372.3 million.

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