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Fair Value of Financial Instruments and Risk Management - Fair Value Hierarchy (Details) - Recurring - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets    
Other investments $ 145 $ 150
Assets, total fair value 205 503
Liabilities    
Liabilities, total fair value (218) (198)
Energy contracts subject to regulatory deferral    
Assets    
Assets 49 304
Liabilities    
Liabilities (209) (164)
Energy contracts not subject to regulatory deferral    
Assets    
Assets 6 49
Liabilities    
Liabilities (3) (8)
Foreign exchange contracts    
Assets    
Assets 5  
Total return and cross-currency interest rate swaps    
Liabilities    
Liabilities (6)  
Foreign exchange contracts, total return and cross-currency interest rate swaps    
Liabilities    
Liabilities   (26)
Level 1    
Assets    
Other investments 145 150
Assets, total fair value 145 150
Liabilities    
Liabilities, total fair value 0 0
Level 1 | Energy contracts subject to regulatory deferral    
Assets    
Assets 0 0
Liabilities    
Liabilities 0 0
Level 1 | Energy contracts not subject to regulatory deferral    
Assets    
Assets 0 0
Liabilities    
Liabilities 0 0
Level 1 | Foreign exchange contracts    
Assets    
Assets 0  
Level 1 | Total return and cross-currency interest rate swaps    
Liabilities    
Liabilities 0  
Level 1 | Foreign exchange contracts, total return and cross-currency interest rate swaps    
Liabilities    
Liabilities   0
Level 2    
Assets    
Other investments 0 0
Assets, total fair value 60 353
Liabilities    
Liabilities, total fair value (218) (198)
Level 2 | Energy contracts subject to regulatory deferral    
Assets    
Assets 49 304
Liabilities    
Liabilities (209) (164)
Level 2 | Energy contracts not subject to regulatory deferral    
Assets    
Assets 6 49
Liabilities    
Liabilities (3) (8)
Level 2 | Foreign exchange contracts    
Assets    
Assets 5  
Level 2 | Total return and cross-currency interest rate swaps    
Liabilities    
Liabilities (6)  
Level 2 | Foreign exchange contracts, total return and cross-currency interest rate swaps    
Liabilities    
Liabilities   (26)
Level 3    
Assets    
Other investments 0 0
Assets, total fair value 0 0
Liabilities    
Liabilities, total fair value 0 0
Level 3 | Energy contracts subject to regulatory deferral    
Assets    
Assets 0 0
Liabilities    
Liabilities 0 0
Level 3 | Energy contracts not subject to regulatory deferral    
Assets    
Assets 0 0
Liabilities    
Liabilities 0 0
Level 3 | Foreign exchange contracts    
Assets    
Assets 0  
Level 3 | Total return and cross-currency interest rate swaps    
Liabilities    
Liabilities $ 0  
Level 3 | Foreign exchange contracts, total return and cross-currency interest rate swaps    
Liabilities    
Liabilities   $ 0