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Earnings Per Common Share (EPS) (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share Reconciliation [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) |  | 2012 |  |  | 2011 |  |  | 2010
Numerator: |  |  |  |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |  |  |  |
|  | Income from continuing operations |  | $ | 4,482 |  | $ | 4,899 |  | $ | 4,057
|  | Earnings allocated to participating |  |  |  |  |  |  |  |  |
|  |  | share awards(a) |  |  | (49) |  |  | (58) |  |  | (51)
|  | Income from discontinued |  |  |  |  |  |  |  |  |
|  |  | operations, net of tax |  |  | ― |  |  | 36 |  |  | ―
|  | Net income attributable to common |  |  |  |  |  |  |  |  |
|  |  | shareholders |  | $ | 4,433 |  | $ | 4,877 |  | $ | 4,006
Denominator:(a) |  |  |  |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 1,135 |  |  | 1,178 |  |  | 1,188
| Add: Weighted-average stock options(b) |  |  | 6 |  |  | 6 |  |  | 7
| Diluted |  |  | 1,141 |  |  | 1,184 |  |  | 1,195
Basic EPS: |  |  |  |  |  |  |  |  |
| Income from continuing operations |  |  |  |  |  |  |  |  |
|  | attributable to common shareholders |  | $ | 3.91 |  | $ | 4.11 |  | $ | 3.37
| Income from discontinued operations |  |  | ― |  |  | 0.03 |  |  | ―
| Net income attributable to common |  |  |  |  |  |  |  |  |
|  | shareholders |  | $ | 3.91 |  | $ | 4.14 |  | $ | 3.37
Diluted EPS: |  |  |  |  |  |  |  |  |
| Income from continuing operations |  |  |  |  |  |  |  |  |
|  | attributable to common shareholders |  | $ | 3.89 |  | $ | 4.09 |  | $ | 3.35
| Income from discontinued operations |  |  | ― |  |  | 0.03 |  |  | ―
| Net income attributable to common |  |  |  |  |  |  |  |  |
|  | shareholders |  | $ | 3.89 |  | $ | 4.12 |  | $ | 3.35
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 attributable to participating securities. The related participating securities are similarly excluded from the denominator. For the years ended December 31, 2012, 2011 and 2010, the dilutive effect of unexercised stock options excludes 8 million, 19 million and 36 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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