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Earnings Per Common Share (EPS) (Tables) | 3 Months Ended
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Mar. 31, 2014
Earnings Per Share Reconciliation [Abstract] |
Computation of basic and diluted EPS | The computations of basic and diluted EPS for the three months ended March 31 were as follows:
(Millions, except per share amounts) |  | 2014 |  |  | 2013
Numerator: |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |
|  | Net income |  | $ | 1,432 |  | $ | 1,280
|  | Earnings allocated to participating share awards(a) |  |  | (12) |  |  | (11)
|  | Net income attributable to common shareholders |  | $ | 1,420 |  | $ | 1,269
Denominator:(a) |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 1,060 |  |  | 1,099
| Add: Weighted-average stock options(b) |  |  | 7 |  |  | 7
| Diluted |  |  | 1,067 |  |  | 1,106
Basic EPS |  | $ | 1.34 |  | $ | 1.15
Diluted EPS |  | $ | 1.33 |  | $ | 1.15
The Company's unvested restricted stock awards, which include the right to receive non-forfeitable divi dends 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. For the three months ended March 31, 2014 and 2013, the dilutive effect of unexercised stock options exclude s 0.2 million and 0.9 million of options, respectively, from the computation of EPS 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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