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Derivatives Instruments (Derivative Assets and Liabilities) (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Cash flow hedges    
Cash flow hedges, Derivative Assets $ 0 $ 0
Cash flow hedges, Derivative Liabilities 1 5
HFT derivatives    
HFT, Derivative Assets 170 187
HFT, Derivative Liabilities 403 479
Other derivatives    
Other, Derivative Assets 1 1
Other, Derivative Liabilities 0 0
Derivative Assets    
Total gross current derivative assets 207 293
Impact of master netting agreements with intent to settle net or simultaneously, Derivative Assets (120) (126)
Derivative Asset, Total 87 167
Derivative Liabilities    
Total gross current derivative liabilities 490 491
Impact of master netting agreements with intent to settle net or simultaneously, Derivative Liabilities (120) (126)
Derivative Liabilities, Total 370 365
Foreign exchange forwards    
Cash flow hedges    
Cash flow hedges, Derivative Assets 0 0
Cash flow hedges, Derivative Liabilities 1 5
Other derivatives    
Other, Derivative Assets 0 0
Other, Derivative Liabilities 0 0
Power swaps and physical contracts    
HFT derivatives    
HFT, Derivative Assets 19 62
HFT, Derivative Liabilities 22 76
Natural gas swaps, futures, forwards, physical contracts    
HFT derivatives    
HFT, Derivative Assets 151 125
HFT, Derivative Liabilities 381 403
Equity derivatives and interest rate swaps    
Other derivatives    
Other, Derivative Assets 1 1
Other, Derivative Liabilities 0 0
Regulatory deferral    
HFT derivatives    
HFT, Derivative Assets 36 105
HFT, Derivative Liabilities 86 7
Derivative Assets    
Impact of master netting agreements with intent to settle net or simultaneously, Derivative Assets (8) (1)
Derivative Liabilities    
Impact of master netting agreements with intent to settle net or simultaneously, Derivative Liabilities (8) (1)
Regulatory deferral | Commodity swaps and forwards | Power    
HFT derivatives    
HFT, Derivative Assets 23 2
HFT, Derivative Liabilities 36 1
Regulatory deferral | Commodity swaps and forwards | Coal    
HFT derivatives    
HFT, Derivative Assets 8 71
HFT, Derivative Liabilities 39 1
Regulatory deferral | Commodity swaps and forwards | Heavy fuel oil purchases    
HFT derivatives    
HFT, Derivative Assets 1 1
HFT, Derivative Liabilities 0 1
Regulatory deferral | Commodity swaps and forwards | Natural gas    
HFT derivatives    
HFT, Derivative Assets 2 2
HFT, Derivative Liabilities 5 4
Regulatory deferral | Foreign exchange forwards    
HFT derivatives    
HFT, Derivative Assets 2 29
HFT, Derivative Liabilities 6 0
HFT derivatives    
Derivative Assets    
Impact of master netting agreements with intent to settle net or simultaneously, Derivative Assets (112) (125)
Derivative Liabilities    
Impact of master netting agreements with intent to settle net or simultaneously, Derivative Liabilities $ (112) $ (125)