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Earnings Per Common Share (EPS) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Common Share (EPS) | 15. Earnings Per Common Share (EPS) The computations of basic and diluted EPS were as follows:
|  |  |  |  |  | Three Months Ended |  | Six Months Ended
|  |  |  |  |  | June 30, |  | June 30,
(Millions, except per share amounts) |  | 2018 |  |  | 2017 |  | 2018 |  |  | 2017
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |  |  |  |  |  |  |
|  | Net income |  | $ | 1,623 |  | $ | 1,344 |  | $ | 3,257 |  | $ | 2,595
|  | Preferred dividends |  |  | (20) |  |  | (19) |  |  | (41) |  |  | (40)
|  | Net income available to common shareholders |  |  | 1,603 |  |  | 1,325 |  |  | 3,216 |  |  | 2,555
|  | Earnings allocated to participating share awards(a) |  |  | (12) |  |  | (11) |  |  | (25) |  |  | (21)
|  | Net income attributable to common shareholders |  | $ | 1,591 |  | $ | 1,314 |  | $ | 3,191 |  | $ | 2,534
Denominator: (a) |  |  |  |  |  |  |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 860 |  |  | 890 |  |  | 859 |  |  | 895
| Add: Weighted-average stock options (b) |  |  | 2 |  |  | 3 |  |  | 3 |  |  | 3
| Diluted |  |  | 862 |  |  | 893 |  |  | 862 |  |  | 898
Basic EPS |  | $ | 1.85 |  | $ | 1.48 |  | $ | 3.71 |  | $ | 2.83
Diluted EPS |  | $ | 1.84 |  | $ | 1.47 |  | $ | 3.70 |  | $ | 2.82
Our unvested restricted stock awards, which include the right to receive non-forfeitable dividends or dividend equivalents, are considered participating securities. Calculations of EPS under the two-class method exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities. The related participating securities are similarly excluded from the denominator. The dilutive effect of unex ercised stock options excludes from the computation of EPS 0.7 million and 1.2 million of options for the three months ended June 30, 2018 and 2017, respectively, and 0.7 million and 1.2 million of options for the six months ended June 30, 2018 and 2017, respectively, because inclusion of the options would have been anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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