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Earnings (Loss) Per Common Share Level 3 (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Computation of Basic and Diluted Earnings per Common Share
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In millions, except for per share data) | 2017 | 2016 |  | 2017 | 2016
Earnings |  |  |  |  |
Net income | $ | 234 |  | $ | 438 |  |  | $ | 572 |  | $ | 977 |
Shares |  |  |  |  |
Weighted average common shares outstanding, basic | 360.2 |  | 383.8 |  |  | 365.9 |  | 391.4 |
Dilutive effect of stock compensation plans | 4.5 |  | 3.2 |  |  | 4.1 |  | 3.5 |
Dilutive effect of warrants | 2.3 |  | 3.5 |  |  | 2.6 |  | 3.6 |
Weighted average common shares outstanding and dilutive potential common shares | 367.0 |  | 390.5 |  |  | 372.6 |  | 398.5 |
Net income per common share |  |  |  |  |
Basic | $ | 0.65 |  | $ | 1.14 |  |  | $ | 1.56 |  | $ | 2.50 |
Diluted | $ | 0.64 |  | $ | 1.12 |  |  | $ | 1.54 |  | $ | 2.45 |

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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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