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Common Share Activities (Detail) (CAD) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 228 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |
Common stock beginning balance, shares | 847,599,000 us-gaap_CommonStockSharesOutstanding |  | 847,599,000 us-gaap_CommonStockSharesOutstanding |  |
Issued under employee share-based awards | 2,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  | 2,776,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |
Purchases at stated value, shares | (2,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  | (2,776,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | (906,543,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |
Common stock, ending balance, shares | 847,599,000 us-gaap_CommonStockSharesOutstanding |  | 847,599,000 us-gaap_CommonStockSharesOutstanding | 847,599,000 us-gaap_CommonStockSharesOutstanding |
Common stock beginning balance, value | 1,566 us-gaap_CommonStockValue | [1] | 1,528 us-gaap_CommonStockValue |  |
Issued under employee share-based awards, value |  |  | 43 us-gaap_ProceedsFromStockOptionsExercised |  |
Purchases at stated value, value |  |  |  | (15,708)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |
Common stock, ending balance, value | 1,566 us-gaap_CommonStockValue | [1] | 1,566 us-gaap_CommonStockValue | 1,566 us-gaap_CommonStockValue | [1]
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Purchases at stated value, value |  |  | (5)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
[1] | Number of common shares outstanding was 848 million (2013 - 848 million), (note 10).

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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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