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Income Taxes (Detail) (CAD) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule Of Income Tax [Line Items] |  |  |  |  |  |
Current income tax expense | 425 |  | 593 |  | 955 |
Deferred income tax expense | 484 | [1] | 634 | [1] | 80 | [1]
Total income tax expense | 909 | [2] | 1,227 | [2] | 1,035 | [2]
Statutory corporate tax rate (percent) | 25.40% |  | 25.50% |  | 25.40% |
Enacted tax rate change |  |  |  |  |  |
Other | (1.10%) |  | (0.90%) |  | (1.90%) |
Effective income tax rate | 24.30% |  | 24.60% |  | 23.50% |
[1] | There were no material net (charges)/credits for the effect of changes in tax laws and rates included in the provisions for deferred income taxes in 2013, 2012 and 2011.
[2] | Cash outflow from income taxes, plus investment credits earned, was $911 million in 2013 (2012 - $871 million, 2011 - $667 million).

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