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Employee Future Benefits - Summary of Cash Payments (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Pension defined benefit plans [member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans $ 157 $ 162
Pension defined benefit plans [member] | Defined benefit plans [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans 79 85
Pension defined benefit plans [member] | Defined contribution plans [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans 78 77
Retiree welfare plans [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans 10 12
Retiree welfare plans [Member] | Defined benefit plans [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans $ 10 $ 12