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Earnings Per Common Share (EPS) | 6 Months Ended
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Jun. 30, 2016
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) |  | 2016 |  |  | 2015 |  | 2016 |  |  | 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |  |  |  |  |  |  |
|  | Net income |  | $ | 2,015 |  | $ | 1,473 |  | $ | 3,441 |  | $ | 2,998
|  | Preferred dividends |  |  | (19) |  |  | (20) |  |  | (40) |  |  | (20)
|  | Net income available to common shareholders |  |  | 1,996 |  |  | 1,453 |  |  | 3,401 |  |  | 2,978
|  | Earnings allocated to participating share awards(a) |  |  | (17) |  |  | (11) |  |  | (28) |  |  | (22)
|  | Net income attributable to common shareholders |  | $ | 1,979 |  | $ | 1,442 |  | $ | 3,373 |  | $ | 2,956
Denominator: (a) |  |  |  |  |  |  |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 938 |  |  | 1,009 |  |  | 949 |  |  | 1,013
| Add: Weighted-average stock options (b) |  |  | 3 |  |  | 4 |  |  | 3 |  |  | 5
| Diluted |  |  | 941 |  |  | 1,013 |  |  | 952 |  |  | 1,018
Basic EPS |  | $ | 2.11 |  | $ | 1.43 |  | $ | 3.55 |  | $ | 2.92
Diluted EPS |  | $ | 2.10 |  | $ | 1.42 |  | $ | 3.54 |  | $ | 2.90
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 attributa ble 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 2.5 million and 0.6 million of options for the three months ended June 30, 2016 and 2015, respectively, and 1.7 million and 0.5 million of options for the six months ended June 30, 2016 and 2015, respectively, because inclusion of the options would have been anti-dilutive. For the three and six months ended June 30, 2016 and 2015, the Company met specified performance measures related to the $750 million of Subordinated Debentures issued in 2006, and maturing in 2036. If the performance measures were not achieved in any given quarter, the Company would be required to issue common shares and apply the proceeds to make interest payments.

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