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Fair Value Measurements (Quantitative Information Significant Unobservable Inputs used in the fair value measurements categorized within Level 3 of the fair value hierarchy) (Details) - CAD ($)
Dec. 31, 2022
Dec. 31, 2021
Assets    
Total assets $ 396,000,000 $ 301,000,000
Liabilities    
Total liabilities 1,078,000,000 682,000,000
Fair Value, Measurements, Recurring    
Assets    
Total assets 396,000,000 301,000,000
Liabilities    
Total liabilities 1,078,000,000 682,000,000
Net liability (682,000,000) (381,000,000)
Regulatory deferral | Fair Value, Measurements, Recurring    
Assets    
Total assets 238,000,000 237,000,000
Liabilities    
Total liabilities 25,000,000 20,000,000
Regulatory deferral | Physical natural gas purchases | Fair Value, Measurements, Recurring    
Assets    
Total assets 52,000,000  
HFT derivatives | Fair Value, Measurements, Recurring    
Assets    
Total assets 153,000,000 53,000,000
Liabilities    
Total liabilities 1,025,000,000 662,000,000
HFT derivatives | Power swaps and physical contracts | Fair Value, Measurements, Recurring    
Assets    
Total assets 44,000,000 13,000,000
Liabilities    
Total liabilities 31,000,000 12,000,000
HFT derivatives | Natural gas swaps, futures, forwards and physical contracts | Fair Value, Measurements, Recurring    
Liabilities    
Total liabilities 994,000,000 650,000,000
Level 3    
Assets    
Total assets 90,000,000 104,000,000
Liabilities    
Total liabilities 826,000,000 518,000,000
Net liability 736,000,000 414,000,000
Level 3 | Fair Value, Measurements, Recurring    
Assets    
Total assets 90,000,000 104,000,000
Liabilities    
Total liabilities 826,000,000 518,000,000
Net liability (736,000,000) (414,000,000)
Level 3 | Regulatory deferral | Fair Value, Measurements, Recurring    
Assets    
Total assets 52,000,000 88,000,000
Liabilities    
Total liabilities 0 0
Level 3 | Regulatory deferral | Physical natural gas purchases    
Assets    
Total assets 52,000,000 88,000,000
Liabilities    
Total liabilities 0 $ 0
Level 3 | Regulatory deferral | Physical natural gas purchases | Fair Value, Measurements, Recurring    
Assets    
Total assets $ 52,000,000  
Level 3 | Regulatory deferral | Range, Minimum | Physical natural gas purchases | Third-party pricing    
Liabilities    
Derivative, measurement input 5.79 4.51
Level 3 | Regulatory deferral | Range, Maximum | Physical natural gas purchases | Third-party pricing    
Liabilities    
Derivative, measurement input 31.85 26.09
Level 3 | Regulatory deferral | Weighted average | Physical natural gas purchases | Third-party pricing    
Liabilities    
Derivative, measurement input 12.27 9.74
Level 3 | HFT derivatives | Fair Value, Measurements, Recurring    
Assets    
Total assets $ 38,000,000 $ 16,000,000
Liabilities    
Total liabilities 826,000,000 518,000,000
Level 3 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets 4,000,000 4,000,000
Liabilities    
Total liabilities 1,000,000 3,000,000
Level 3 | HFT derivatives | Power swaps and physical contracts | Fair Value, Measurements, Recurring    
Assets    
Total assets 4,000,000 4,000,000
Liabilities    
Total liabilities 1,000,000 3,000,000
Level 3 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Assets    
Total assets 34,000,000 12,000,000
Liabilities    
Total liabilities 825,000,000 515,000,000
Level 3 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts | Fair Value, Measurements, Recurring    
Liabilities    
Total liabilities $ 825,000,000 $ 515,000,000
Level 3 | HFT derivatives | Range, Minimum | Power swaps and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 43.24 37.05
Level 3 | HFT derivatives | Range, Minimum | Natural gas swaps, futures, forwards and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 2.45 1.90
Level 3 | HFT derivatives | Range, Maximum | Power swaps and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 269.10 213.00
Level 3 | HFT derivatives | Range, Maximum | Natural gas swaps, futures, forwards and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 33.88 21.53
Level 3 | HFT derivatives | Weighted average | Power swaps and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 138.79 99.34
Level 3 | HFT derivatives | Weighted average | Natural gas swaps, futures, forwards and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 12.01 8.80