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Earnings Per Common Share (EPS) (Tables) | 12 Months Ended
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Dec. 31, 2015
Table Text Block [Abstract] |
Computation of basic and diluted EPS | The computations of basic and diluted EPS for the years ended December 31 were as follows:
(Millions, except per share amounts) |  | 2015 |  |  | 2014 |  |  | 2013
Numerator: |  |  |  |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |  |  |  |
|  | Net income |  | $ | 5,163 |  | $ | 5,885 |  | $ | 5,359
|  | Preferred dividends |  |  | (62) |  |  | ― |  |  | ―
|  | Net income available to common shareholders |  |  | 5,101 |  |  | 5,885 |  |  | 5,359
|  | Earnings allocated to participating share awards(a) |  |  | (38) |  |  | (46) |  |  | (47)
|  | Net income attributable to common shareholders |  | $ | 5,063 |  | $ | 5,839 |  | $ | 5,312
Denominator:(a) |  |  |  |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 999 |  |  | 1,045 |  |  | 1,082
| Add: Weighted-average stock options(b) |  |  | 4 |  |  | 6 |  |  | 7
| Diluted |  |  | 1,003 |  |  | 1,051 |  |  | 1,089
Basic EPS |  | $ | 5.07 |  | $ | 5.58 |  | $ | 4.91
Diluted EPS |  | $ | 5.05 |  | $ | 5.56 |  | $ | 4.88
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. T he dilutive effect of unexercise d stock options excludes from the computation of EPS 0.5 million, 0.2 million and 0.1 million of options f or the years ended December 31, 2015, 2014 and 2013, 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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