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Earnings Per Common Share (EPS) | 3 Months Ended
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Mar. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Common Share (EPS) | 15. Earnings Per Common Share (EPS) The computations of basic and diluted EPS for the three months ended March 31 were as follows:
(Millions, except per share amounts) |  | 2017 |  |  | 2016
Numerator: |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |
|  | Net income |  | $ | 1,237 |  | $ | 1,426
|  | Preferred dividends |  |  | (21) |  |  | (21)
|  | Net income available to common shareholders |  | $ | 1,216 |  | $ | 1,405
|  | Earnings allocated to participating share awards(a) |  |  | (10) |  |  | (11)
|  | Net income attributable to common shareholders |  | $ | 1,206 |  | $ | 1,394
Denominator:(a) |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 899 |  |  | 961
| Add: Weighted-average stock options (b) |  |  | 4 |  |  | 2
| Diluted |  |  | 903 |  |  | 963
Basic EPS |  | $ | 1.34 |  | $ | 1.45
Diluted EPS |  | $ | 1.34 |  | $ | 1.45
The Company’s 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 1.2 million and 1.5 million of options for the three months ended March 31, 2017 and 2016, respectively, because inclusion of the options would have been anti-dilutive.

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