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Fair Value of Pension Plan Assets Including Level Within Fair Value Hierarchy (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value $ 8,599 $ 7,691
Investments that are measured at fair value using net asset value 8,559 7,658
Canadian Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 210 170
Investments that are measured at fair value using net asset value 210 170
Non-Canadian Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 2,449 2,035
Investments that are measured at fair value using net asset value 2,449 2,035
Corporate Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 1,379 1,231
Investments that are measured at fair value using net asset value 1,379 1,231
Government Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 4,299 3,987
Investments that are measured at fair value using net asset value 4,299 3,987
Asset Backed Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 1 3
Investments that are measured at fair value using net asset value 1 3
Equities - Venture Capital    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 204 226
Investments that are measured at fair value using net asset value 204 226
Cash    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 57 39
Investments that are measured at fair value using net asset value 17 6
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 40 33
Level 1 | Cash    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value $ 40 $ 33