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FV Measurements (Classification of Fair Value of Derivatives) (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Assets    
Less: Derivatives classified as held for sale $ (1) $ 0
Total assets 166 240
Liabilities    
Less: Derivatives classified as held for sale (1) 0
Total liabilities 617 504
Level 3    
Assets    
Total assets 32 34
Liabilities    
Total liabilities 441 365
Net assets (liabilities) (409) (331)
Level 3 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets 5  
Liabilities    
Total liabilities 4  
Level 3 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Assets    
Total assets 27 34
Liabilities    
Total liabilities 437 365
Fair Value, Measurements, Recurring    
Assets    
Less: Derivatives classified as held for sale (1)  
Total assets 166 240
Liabilities    
Less: Derivatives classified as held for sale (1)  
Total liabilities 617 504
Net assets (liabilities) (451) (264)
Fair Value, Measurements, Recurring | Other    
Assets    
Total assets   22
Liabilities    
Total liabilities 36 7
Fair Value, Measurements, Recurring | FX forwards | Other    
Assets    
Total assets   18
Liabilities    
Total liabilities 34 7
Fair Value, Measurements, Recurring | Equity derivatives | Other    
Assets    
Total assets   4
Liabilities    
Less: Derivatives classified as held for sale (2)  
Fair Value, Measurements, Recurring | Regulatory deferral    
Assets    
Total assets 45 16
Liabilities    
Total liabilities 40 76
Fair Value, Measurements, Recurring | Regulatory deferral | Commodity swaps and forwards    
Assets    
Total assets 18 13
Liabilities    
Total liabilities 37 73
Fair Value, Measurements, Recurring | Regulatory deferral | FX forwards    
Assets    
Total assets 27 3
Liabilities    
Total liabilities 3 3
Fair Value, Measurements, Recurring | HFT derivatives    
Assets    
Total assets 122 202
Liabilities    
Total liabilities 542 421
Fair Value, Measurements, Recurring | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets 30 18
Liabilities    
Total liabilities 27 24
Fair Value, Measurements, Recurring | HFT derivatives | Natural gas swaps, futures, forwards, physical contracts    
Assets    
Total assets 92 184
Fair Value, Measurements, Recurring | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Liabilities    
Total liabilities 515 397
Fair Value, Measurements, Recurring | Level 1    
Assets    
Less: Derivatives classified as held for sale 0  
Total assets 30 48
Liabilities    
Less: Derivatives classified as held for sale 0  
Total liabilities 11 56
Net assets (liabilities) 19 (8)
Fair Value, Measurements, Recurring | Level 1 | Other    
Assets    
Total assets   4
Liabilities    
Total liabilities 2 0
Fair Value, Measurements, Recurring | Level 1 | FX forwards | Other    
Assets    
Total assets   0
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Equity derivatives | Other    
Assets    
Total assets   4
Liabilities    
Less: Derivatives classified as held for sale (2)  
Fair Value, Measurements, Recurring | Level 1 | Regulatory deferral    
Assets    
Total assets 15 7
Liabilities    
Total liabilities 18 43
Fair Value, Measurements, Recurring | Level 1 | Regulatory deferral | Commodity swaps and forwards    
Assets    
Total assets 15 7
Liabilities    
Total liabilities 18 43
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 | HFT derivatives    
Assets    
Total assets 15 37
Liabilities    
Total liabilities (9) 13
Fair Value, Measurements, Recurring | Level 1 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets 2 (5)
Liabilities    
Total liabilities 2 0
Fair Value, Measurements, Recurring | Level 1 | HFT derivatives | Natural gas swaps, futures, forwards, physical contracts    
Assets    
Total assets 13 42
Fair Value, Measurements, Recurring | Level 1 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Liabilities    
Total liabilities (11) 13
Fair Value, Measurements, Recurring | Level 2    
Assets    
Less: Derivatives classified as held for sale (1)  
Total assets 104 158
Liabilities    
Less: Derivatives classified as held for sale (1)  
Total liabilities 165 83
Net assets (liabilities) (61) 75
Fair Value, Measurements, Recurring | Level 2 | Other    
Assets    
Total assets   18
Liabilities    
Total liabilities 34 7
Fair Value, Measurements, Recurring | Level 2 | FX forwards | Other    
Assets    
Total assets   18
Liabilities    
Total liabilities 34 7
Fair Value, Measurements, Recurring | Level 2 | Equity derivatives | Other    
Assets    
Total assets   0
Liabilities    
Less: Derivatives classified as held for sale 0  
Fair Value, Measurements, Recurring | Level 2 | Regulatory deferral    
Assets    
Total assets 30 9
Liabilities    
Total liabilities 22 33
Fair Value, Measurements, Recurring | Level 2 | Regulatory deferral | Commodity swaps and forwards    
Assets    
Total assets 3 6
Liabilities    
Total liabilities 19 30
Fair Value, Measurements, Recurring | Level 2 | Regulatory deferral | FX forwards    
Assets    
Total assets 27 3
Liabilities    
Total liabilities 3 3
Fair Value, Measurements, Recurring | Level 2 | HFT derivatives    
Assets    
Total assets 75 131
Liabilities    
Total liabilities 110 43
Fair Value, Measurements, Recurring | Level 2 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets 23 23
Liabilities    
Total liabilities 21 24
Fair Value, Measurements, Recurring | Level 2 | HFT derivatives | Natural gas swaps, futures, forwards, physical contracts    
Assets    
Total assets 52 108
Fair Value, Measurements, Recurring | Level 2 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Liabilities    
Total liabilities 89 19
Fair Value, Measurements, Recurring | Level 3    
Assets    
Less: Derivatives classified as held for sale 0  
Total assets 32 34
Liabilities    
Less: Derivatives classified as held for sale 0  
Total liabilities 441 365
Net assets (liabilities) (409) (331)
Fair Value, Measurements, Recurring | Level 3 | Other    
Assets    
Total assets   0
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | FX forwards | Other    
Assets    
Total assets   0
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Equity derivatives | Other    
Assets    
Total assets   0
Liabilities    
Less: Derivatives classified as held for sale 0  
Fair Value, Measurements, Recurring | Level 3 | Regulatory deferral    
Assets    
Total assets 0 0
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 | HFT derivatives    
Assets    
Total assets 32 34
Liabilities    
Total liabilities 441 365
Fair Value, Measurements, Recurring | Level 3 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets 5 0
Liabilities    
Total liabilities 4 0
Fair Value, Measurements, Recurring | Level 3 | HFT derivatives | Natural gas swaps, futures, forwards, physical contracts    
Assets    
Total assets 27 34
Fair Value, Measurements, Recurring | Level 3 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Liabilities    
Total liabilities $ 437 $ 365