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Earnings Per Common Share (EPS) (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share Reconciliation [Abstract] |
Computation of basic and diluted EPS | The computations of basic and diluted EPS were as follows:
|  |  |  |  |  | Three Months Ended |  | Nine Months Ended
|  |  |  |  |  | September 30, |  | September 30,
(Millions, except per share amounts) |  | 2018 |  |  | 2017 |  | 2018 |  |  | 2017
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |  |  |  |  |  |  |
|  | Net income |  | $ | 1,654 |  | $ | 1,359 |  | $ | 4,911 |  | $ | 3,954
|  | Preferred dividends |  |  | (20) |  |  | (21) |  |  | (61) |  |  | (61)
|  | Net income available to common shareholders |  |  | 1,634 |  |  | 1,338 |  |  | 4,850 |  |  | 3,893
|  | Earnings allocated to participating share awards(a) |  |  | (13) |  |  | (11) |  |  | (38) |  |  | (32)
|  | Net income attributable to common shareholders |  | $ | 1,621 |  | $ | 1,327 |  | $ | 4,812 |  | $ | 3,861
Denominator: (a) |  |  |  |  |  |  |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 858 |  |  | 878 |  |  | 859 |  |  | 889
| Add: Weighted-average stock options (b) |  |  | 2 |  |  | 3 |  |  | 2 |  |  | 3
| Diluted |  |  | 860 |  |  | 881 |  |  | 861 |  |  | 892
Basic EPS |  | $ | 1.89 |  | $ | 1.51 |  | $ | 5.60 |  | $ | 4.34
Diluted EPS |  | $ | 1.88 |  | $ | 1.51 |  | $ | 5.59 |  | $ | 4.33
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 0.5 million of options for the three months ended September 30, 2018 and 2017, respectively, and 0.7 million and 0.8 million of options for the nine months ended September 30, 2018 and 2017, respectively, because inclusion of the options would have been anti-dilutive.

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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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