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Employee Benefit Plans (Amounts Recognized in the Consolidated Balance Sheets) (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Balance Sheet    
Other current liabilities $ (23) $ (22)
Long-term liabilities (453) (460)
Long-term liabilities associated with assets held for sale 0 (899)
Defined benefit pension plans    
Balance Sheet    
Other current liabilities (4) (4)
Long-term liabilities (163) (206)
Long-term liabilities associated with assets held for sale 0 (30)
Other long-term assets 13 11
Amount included in deferred income tax (4) (7)
AOCI, net of tax and regulatory assets 443 524
Net amount recognized 285 288
Non-pension Benefit Plans    
Balance Sheet    
Other current liabilities (19) (18)
Long-term liabilities (290) (254)
Long-term liabilities associated with assets held for sale 0 (44)
Other long-term assets 20 19
Amount included in deferred income tax (1) (1)
AOCI, net of tax and regulatory assets 107 72
Net amount recognized $ (183) $ (224)