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Pensions and Other Post-Employment Benefits - Summary of Pension and OPEB Costs (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits      
Disclosure of defined benefit plans [line items]      
Current Service Costs $ 16 $ 16 $ 13
Past Service Costs - Curtailments and Plan Amendments 0 (1) 0
Interest Costs (2) 3 3 3
Re-measurements:      
Return on Plan Assets (Excluding Interest Income) 26 (9) (5)
(Gains) Losses From Experience Adjustments 1 4 1
(Gains) Losses From Changes in Demographic Assumptions 0 (1) 0
(Gains) Losses From Changes in Financial Assumptions (64) (18) 15
Defined Benefit Plan Cost (Recovery) (18) (6) 27
Defined Contribution Plan Cost (1) 72 68 22
Total Plan Cost 54 62 49
OPEB      
Disclosure of defined benefit plans [line items]      
Current Service Costs 8 9 1
Past Service Costs - Curtailments and Plan Amendments 0 (3) 0
Interest Costs (2) 7 6 0
Re-measurements:      
Return on Plan Assets (Excluding Interest Income) 0 0 0
(Gains) Losses From Experience Adjustments (2) 10 (2)
(Gains) Losses From Changes in Demographic Assumptions 0 (3) 0
(Gains) Losses From Changes in Financial Assumptions (57) (30) 1
Defined Benefit Plan Cost (Recovery) (44) (11) 0
Defined Contribution Plan Cost (1) 0 0 0
Total Plan Cost $ (44) $ (11) $ 0