v3.22.4
Pensions and Other Postretirement Benefits (Amounts Recognized in the Consolidated Balance Sheet) (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]    
Noncurrent assets - Pension asset $ 3,033 $ 3,050
Current liabilities (14) (14)
Noncurrent liabilities - Pension and other postretirement benefits (486) (645)
Pension Plan [Member]    
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]    
Noncurrent assets - Pension asset 3,033 3,050
Current liabilities 0 0
Noncurrent liabilities - Pension and other postretirement benefits (353) (447)
Total amount recognized 2,680 2,603
Other postretirement benefits [Member]    
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]    
Noncurrent assets - Pension asset 0 0
Current liabilities (14) (14)
Noncurrent liabilities - Pension and other postretirement benefits (133) (198)
Total amount recognized $ (147) $ (212)