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Earnings Per Common Share (EPS) (Tables) | 3 Months Ended
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Mar. 31, 2013
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) |  | 2013 |  |  | 2012
Numerator: |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |
|  | Net income |  | $ | 1,280 |  | $ | 1,256
|  | Earnings allocated to participating share awards(a) |  |  | (11) |  |  | (14)
|  | Net income attributable to common shareholders |  | $ | 1,269 |  | $ | 1,242
Denominator:(a) |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 1,099 |  |  | 1,160
| Add: Weighted-average stock options(b) |  |  | 7 |  |  | 6
| Diluted |  |  | 1,106 |  |  | 1,166
Basic EPS |  | $ | 1.15 |  | $ | 1.07
Diluted EPS |  | $ | 1.15 |  | $ | 1.07
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, 2013 and 2012, the dilutive effect of unexercised stock options excludes 1 million and 8 million 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 the reconciliation of basic net earnings per share (or unit) to diluted earnings per share (or unit). + 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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