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FV Measurements (Quantitative Information About Significant Unobservable Inputs Used in Level 3 Measurements) (Details) - CAD ($)
Dec. 31, 2023
Dec. 31, 2022
Assets    
Total assets $ 240,000,000 $ 396,000,000
Liabilities    
Total liabilities 504,000,000 1,078,000,000
Fair Value, Measurements, Recurring    
Assets    
Total assets 240,000,000 396,000,000
Liabilities    
Total liabilities 504,000,000 1,078,000,000
Net liability 264,000,000 682,000,000
Regulatory deferral | Fair Value, Measurements, Recurring    
Assets    
Total assets 16,000,000 238,000,000
Liabilities    
Total liabilities 76,000,000 25,000,000
HFT derivatives | Fair Value, Measurements, Recurring    
Assets    
Total assets 202,000,000 153,000,000
Liabilities    
Total liabilities 421,000,000 1,025,000,000
HFT derivatives | Power swaps and physical contracts | Fair Value, Measurements, Recurring    
Assets    
Total assets 18,000,000 44,000,000
Liabilities    
Total liabilities 24,000,000 31,000,000
HFT derivatives | Natural gas swaps, futures, forwards and physical contracts | Fair Value, Measurements, Recurring    
Liabilities    
Total liabilities 397,000,000 994,000,000
Level 3    
Assets    
Total assets 34,000,000 90,000,000
Liabilities    
Total liabilities 365,000,000 826,000,000
Net liability 331,000,000 736,000,000
Level 3 | Fair Value, Measurements, Recurring    
Assets    
Total assets 34,000,000 90,000,000
Liabilities    
Total liabilities 365,000,000 826,000,000
Net liability 331,000,000 736,000,000
Level 3 | Regulatory deferral | Fair Value, Measurements, Recurring    
Assets    
Total assets 0 52,000,000
Liabilities    
Total liabilities 0 0
Level 3 | Regulatory deferral | Physical natural gas purchases    
Assets    
Total assets   52,000,000
Liabilities    
Total liabilities   $ 0
Level 3 | Regulatory deferral | Range, Minimum | Physical natural gas purchases | Third-party pricing    
Liabilities    
Derivative, measurement input   5.79
Level 3 | Regulatory deferral | Range, Maximum | Physical natural gas purchases | Third-party pricing    
Liabilities    
Derivative, measurement input   31.85
Level 3 | Regulatory deferral | Weighted average | Physical natural gas purchases | Third-party pricing    
Liabilities    
Derivative, measurement input   12.27
Level 3 | HFT derivatives | Fair Value, Measurements, Recurring    
Assets    
Total assets 34,000,000 $ 38,000,000
Liabilities    
Total liabilities 365,000,000 826,000,000
Level 3 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets   4,000,000
Liabilities    
Total liabilities   1,000,000
Level 3 | HFT derivatives | Power swaps and physical contracts | Fair Value, Measurements, Recurring    
Assets    
Total assets 0 4,000,000
Liabilities    
Total liabilities 0 1,000,000
Level 3 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Assets    
Total assets 34,000,000 34,000,000
Liabilities    
Total liabilities 365,000,000 825,000,000
Level 3 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts | Fair Value, Measurements, Recurring    
Liabilities    
Total liabilities $ 365,000,000 $ 825,000,000
Level 3 | HFT derivatives | Range, Minimum | Power swaps and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input   43.24
Level 3 | HFT derivatives | Range, Minimum | Natural gas swaps, futures, forwards and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 1.27 2.45
Level 3 | HFT derivatives | Range, Maximum | Power swaps and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input   269.10
Level 3 | HFT derivatives | Range, Maximum | Natural gas swaps, futures, forwards and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 16.25 33.88
Level 3 | HFT derivatives | Weighted average | Power swaps and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input   138.79
Level 3 | HFT derivatives | Weighted average | Natural gas swaps, futures, forwards and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 4.85 12.01