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Earnings Per Common Share (EPS) (Tables) | 12 Months Ended
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Dec. 31, 2014
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) |  | 2014 |  |  | 2013 |  |  | 2012
Numerator: |  |  |  |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |  |  |  |
|  | Net income |  | $ | 5,885 |  | $ | 5,359 |  | $ | 4,482
|  | Earnings allocated to participating share awards(a) |  |  | (46) |  |  | (47) |  |  | (49)
|  | Net income attributable to common shareholders |  | $ | 5,839 |  | $ | 5,312 |  | $ | 4,433
Denominator:(a) |  |  |  |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 1,045 |  |  | 1,082 |  |  | 1,135
| Add: Weighted-average stock options(b) |  |  | 6 |  |  | 7 |  |  | 6
| Diluted |  |  | 1,051 |  |  | 1,089 |  |  | 1,141
Basic EPS |  | $ | 5.58 |  | $ | 4.91 |  | $ | 3.91
Diluted EPS |  | $ | 5.56 |  | $ | 4.88 |  | $ | 3.89
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 0.2 million, 0.1 million and 7.6 million options from the computation of EPS f or the years ended December 31, 2014, 2013 and 2012, 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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