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Earnings Per Common Share (EPS) | 3 Months Ended
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Mar. 31, 2012
Earnings Per Share [Abstract] |
Earnings Per Common Share (EPS) | 12. E arnings P er C ommon S hare (EPS) The computations of basic and diluted EPS for the three months ended March 31 were as follows:
(Millions, except per share amounts) |  | 2012 |  |  | 2011
Numerator: |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |
|  | Net income |  | $ | 1,256 |  | $ | 1,177
|  | Earnings allocated to participating share awards(a) |  |  | (14) |  |  | (14)
|  | Net income attributable to common shareholders |  | $ | 1,242 |  | $ | 1,163
Denominator:(a) |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 1,160 |  |  | 1,192
| Add: Weighted-average stock options(b) |  |  | 6 |  |  | 6
| Diluted |  |  | 1,166 |  |  | 1,198
Basic EPS |  | $ | 1.07 |  | $ | 0.98
Diluted EPS |  | $ | 1.07 |  | $ | 0.97

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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