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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Net Change in Fair Value of Derivative Assets and Liabilities Classified as Level III (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue    
Net change in the Level III fair value category    
Unrealized losses attributed to derivatives in the Level III category $ 3 $ 5
Commodity contracts | Power    
Net change in the Level III fair value category    
Balance at beginning of year (4) (7)
Transfers out of Level III 4 5
Total (losses)/gains included in Net income (3) 8
Total losses included in OCI (4) 0
Settlements 0 (9)
Foreign exchange 0 (1)
Balance at end of year $ (7) $ (4)