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Earnings (Loss) Per Common Share Level 3 (Tables) | 3 Months Ended
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Mar. 31, 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 March 31,
(In millions, except for per share data) | 2017 | 2016
Earnings |  |
Net income | $ | 378 |  | $ | 323 |
Shares |  |
Weighted average common shares outstanding, basic | 371.4 |  | 398.5 |
Dilutive effect of stock compensation plans | 4.2 |  | 4.2 |
Dilutive effect of warrants | 3.0 |  | 3.6 |
Weighted average common shares outstanding and dilutive potential common shares | 378.6 |  | 406.3 |
Net income per common share |  |
Basic | $ | 1.02 |  | $ | 0.81 |
Diluted | $ | 1.00 |  | $ | 0.79 |

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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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