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Financing Costs and Additional Notes and Loans Payable Information (Detail) (CAD)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt-related interest 82us-gaap_InterestAndDebtExpense 69us-gaap_InterestAndDebtExpense 20us-gaap_InterestAndDebtExpense
Capitalized interest (82)us-gaap_InterestPaidCapitalized (69)us-gaap_InterestPaidCapitalized (20)us-gaap_InterestPaidCapitalized
Net interest expense         
Other interest 4us-gaap_InterestExpenseOther 11us-gaap_InterestExpenseOther (1)us-gaap_InterestExpenseOther
Total financing costs 4us-gaap_InterestExpense [1] 11us-gaap_InterestExpense [1] (1)us-gaap_InterestExpense [1]
[1] Cash interest payments in 2014 were $82 million (2013 - $69 million, 2012 - $20 million). The weighted average interest rate on short-term borrowings in 2014 was 1.1 percent (2013 - 1.1 percent).