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Common Share Activities (Detail) (CAD) In Millions, except Share data in Thousands, unless otherwise specified | 12 Months Ended | 192 Months Ended | 216 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |
Common stock beginning balance, shares | 847,599 |  | 847,599 |  |  |
Issued under employee share-based awards | 2,776 |  | 1,262 |  |  |
Purchases at stated value, shares | (2,776) |  | (1,262) | (903,765) | (906,541) |
Common stock, ending balance, shares | 847,599 |  | 847,599 | 847,599 | 847,599 |
Common stock beginning balance, value | 1,528 |  | 1,511 |  |  |
Issued under employee share-based awards, value | 43 |  | 19 |  |  |
Purchases at stated value, value | (128) |  |  | (15,580) | (15,708) |
Common stock, ending balance, value | 1,566 | [1] | 1,528 | 1,528 | 1,566 | [1]
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Purchases at stated value, value | (5) |  | (2) |  |  |
[1] | Number of common shares outstanding was 848 million (2012 - 848 million), (note 10).

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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