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Long-term Debt and Capital Structure - Schedule Remaining Principal Amounts of U.S. Dollar Denominated Unsecured Notes (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   $ 5,898   $ 4,998
Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) $ 7,510   $ 6,757  
3.00% Due August 15, 2022 [Member] | Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   500   500
Total Debt Principal, (CAD equivalent) 637   650  
3.80% Due September 15, 2023 [Member] | Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   450   450
Total Debt Principal, (CAD equivalent) 573   585  
5.38% due July 15, 2025 [Member] | Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   1,000    
Total Debt Principal, (CAD equivalent) 1,273      
4.25% Due April 15, 2027 [Member] | Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   962   962
Total Debt Principal, (CAD equivalent) 1,225   1,249  
5.25% Due June 15, 2037 [Member] | Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   583   641
Total Debt Principal, (CAD equivalent) 742   833  
6.75% due November 15, 2039 [Member] | Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   1,390   1,400
Total Debt Principal, (CAD equivalent) 1,770   1,818  
4.45% Due September 15, 2042 [Member] | Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   155   155
Total Debt Principal, (CAD equivalent) 198   202  
5.20% Due September 15, 2043 [Member] | Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   58   58
Total Debt Principal, (CAD equivalent) 74   75  
5.40% Due June 15, 2047 [Member] | Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   800   832
Total Debt Principal, (CAD equivalent) 1,018   1,080  
U.S. Dollar Denominated Unsecured Notes [Member] | Long-term Borrowings [Member]        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal   $ 5,898   $ 4,998
Total Debt Principal, (CAD equivalent) $ 7,510   $ 6,492