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Earnings (Loss) Per Common Share Level 3 (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table 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 |

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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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