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FV Measurements (Classification of Fair Value of Derivatives) (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets    
Total assets $ 240 $ 396
Liabilities    
Total liabilities 504 1,078
Level 3    
Assets    
Total assets 34 90
Liabilities    
Total liabilities 365 826
Net assets (liabilities) (331) (736)
Level 3 | Regulatory deferral | Physical natural gas purchases    
Assets    
Total assets   52
Liabilities    
Total liabilities   0
Level 3 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets   4
Liabilities    
Total liabilities   1
Level 3 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Assets    
Total assets 34 34
Liabilities    
Total liabilities 365 825
Fair Value, Measurements, Recurring    
Assets    
Total assets 240 396
Liabilities    
Total liabilities 504 1,078
Net assets (liabilities) (264) (682)
Fair Value, Measurements, Recurring | Other    
Assets    
Total assets 22  
Liabilities    
Total liabilities 7  
Fair Value, Measurements, Recurring | FX forwards | Other    
Assets    
Total assets 18 5
Liabilities    
Total liabilities 7 23
Fair Value, Measurements, Recurring | Equity derivatives | Other    
Assets    
Total assets 4  
Liabilities    
Total liabilities   5
Fair Value, Measurements, Recurring | Regulatory deferral    
Assets    
Total assets 16 238
Liabilities    
Total liabilities 76 25
Fair Value, Measurements, Recurring | Regulatory deferral | Commodity swaps and forwards    
Assets    
Total assets 13 168
Liabilities    
Total liabilities 73 24
Fair Value, Measurements, Recurring | Regulatory deferral | FX forwards    
Assets    
Total assets 3 18
Liabilities    
Total liabilities 3 1
Fair Value, Measurements, Recurring | Regulatory deferral | Physical natural gas purchases and sales    
Assets    
Total assets   52
Fair Value, Measurements, Recurring | HFT derivatives    
Assets    
Total assets 202 153
Liabilities    
Total liabilities 421 1,025
Fair Value, Measurements, Recurring | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets 18 44
Liabilities    
Total liabilities 24 31
Fair Value, Measurements, Recurring | HFT derivatives | Natural gas swaps, futures, forwards, physical contracts    
Assets    
Total assets 184 109
Fair Value, Measurements, Recurring | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Liabilities    
Total liabilities 397 994
Fair Value, Measurements, Recurring | Level 1    
Assets    
Total assets 48 132
Liabilities    
Total liabilities 56 73
Net assets (liabilities) (8) 59
Fair Value, Measurements, Recurring | Level 1 | Other    
Assets    
Total assets 4  
Liabilities    
Total liabilities 0  
Fair Value, Measurements, Recurring | Level 1 | FX forwards | Other    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Equity derivatives | Other    
Assets    
Total assets 4  
Liabilities    
Total liabilities   5
Fair Value, Measurements, Recurring | Level 1 | Regulatory deferral    
Assets    
Total assets 7 120
Liabilities    
Total liabilities 43 15
Fair Value, Measurements, Recurring | Level 1 | Regulatory deferral | Commodity swaps and forwards    
Assets    
Total assets 7 120
Liabilities    
Total liabilities 43 15
Fair Value, Measurements, Recurring | Level 1 | Regulatory deferral | FX forwards    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Regulatory deferral | Physical natural gas purchases and sales    
Assets    
Total assets   0
Fair Value, Measurements, Recurring | Level 1 | HFT derivatives    
Assets    
Total assets 37 12
Liabilities    
Total liabilities 13 53
Fair Value, Measurements, Recurring | Level 1 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets (5) 9
Liabilities    
Total liabilities 0 2
Fair Value, Measurements, Recurring | Level 1 | HFT derivatives | Natural gas swaps, futures, forwards, physical contracts    
Assets    
Total assets 42 3
Fair Value, Measurements, Recurring | Level 1 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Liabilities    
Total liabilities 13 51
Fair Value, Measurements, Recurring | Level 2    
Assets    
Total assets 158 174
Liabilities    
Total liabilities 83 179
Net assets (liabilities) 75 (5)
Fair Value, Measurements, Recurring | Level 2 | Other    
Assets    
Total assets 18  
Liabilities    
Total liabilities 7  
Fair Value, Measurements, Recurring | Level 2 | FX forwards | Other    
Assets    
Total assets 18 5
Liabilities    
Total liabilities 7 23
Fair Value, Measurements, Recurring | Level 2 | Equity derivatives | Other    
Assets    
Total assets 0  
Liabilities    
Total liabilities   0
Fair Value, Measurements, Recurring | Level 2 | Regulatory deferral    
Assets    
Total assets 9 66
Liabilities    
Total liabilities 33 10
Fair Value, Measurements, Recurring | Level 2 | Regulatory deferral | Commodity swaps and forwards    
Assets    
Total assets 6 48
Liabilities    
Total liabilities 30 9
Fair Value, Measurements, Recurring | Level 2 | Regulatory deferral | FX forwards    
Assets    
Total assets 3 18
Liabilities    
Total liabilities 3 1
Fair Value, Measurements, Recurring | Level 2 | Regulatory deferral | Physical natural gas purchases and sales    
Assets    
Total assets   0
Fair Value, Measurements, Recurring | Level 2 | HFT derivatives    
Assets    
Total assets 131 103
Liabilities    
Total liabilities 43 146
Fair Value, Measurements, Recurring | Level 2 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets 23 31
Liabilities    
Total liabilities 24 28
Fair Value, Measurements, Recurring | Level 2 | HFT derivatives | Natural gas swaps, futures, forwards, physical contracts    
Assets    
Total assets 108 72
Fair Value, Measurements, Recurring | Level 2 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Liabilities    
Total liabilities 19 118
Fair Value, Measurements, Recurring | Level 3    
Assets    
Total assets 34 90
Liabilities    
Total liabilities 365 826
Net assets (liabilities) (331) (736)
Fair Value, Measurements, Recurring | Level 3 | Other    
Assets    
Total assets 0  
Liabilities    
Total liabilities 0  
Fair Value, Measurements, Recurring | Level 3 | FX forwards | Other    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Equity derivatives | Other    
Assets    
Total assets 0  
Liabilities    
Total liabilities   0
Fair Value, Measurements, Recurring | Level 3 | Regulatory deferral    
Assets    
Total assets 0 52
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Regulatory deferral | Commodity swaps and forwards    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Regulatory deferral | FX forwards    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Regulatory deferral | Physical natural gas purchases and sales    
Assets    
Total assets   52
Fair Value, Measurements, Recurring | Level 3 | HFT derivatives    
Assets    
Total assets 34 38
Liabilities    
Total liabilities 365 826
Fair Value, Measurements, Recurring | Level 3 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets 0 4
Liabilities    
Total liabilities 0 1
Fair Value, Measurements, Recurring | Level 3 | HFT derivatives | Natural gas swaps, futures, forwards, physical contracts    
Assets    
Total assets 34 34
Fair Value, Measurements, Recurring | Level 3 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Liabilities    
Total liabilities $ 365 $ 825