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v2.4.1.9

Financing Costs and Additional Notes and Loans Payable Information (Parenthetical) (Detail) (CAD) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash interest payments | 82 us-gaap_InterestPaid | 69 us-gaap_InterestPaid | 20 us-gaap_InterestPaid
Weighted average interest rate on short-term borrowings | 1.10%us-gaap_ShortTermDebtWeightedAverageInterestRate | 1.10%us-gaap_ShortTermDebtWeightedAverageInterestRate |

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