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Earnings (Loss) Per Common Share Level 1 (Notes) | 3 Months Ended
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Mar. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share [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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