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Financing Expenses (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Financing Expenses    
Interest on debt $ 815 $ 834
Interest on lease liabilities 167 161
Capitalized interest at 5.2% ( 2021 - 5.0%) $ (168) $ (144)
Interest rate 5.20% 5.00%
Interest expense $ 814 $ 851
Interest on partnership liability 51 51
Interest on pension and other post-retirement benefits 41 59
Accretion 316 304
Foreign exchange loss (gain) on U.S. dollar denominated debt 729 (113)
Operational foreign exchange and other 28 23
Loss on extinguishment of long-term debt 32 80
Financing Expenses $ 2,011 $ 1,255