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).