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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Schedule of Changes in Net Fair Value of Derivative Assets and Liabilities Classified as Level 3 in the Fair Value Hierarchy (Details) - CAD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Changes in net fair value of derivative assets and liabilities classified as Level 3    
Level 3 net derivative liability at beginning of period $ (52) $ (131)
Total gain/(loss), unrealized    
Included in earnings1 84 1
Included in OCI (1) 19
Included in regulatory assets/liabilities 44 0
Settlements 115 2
Level 3 net derivative asset/(liability) at end of period $ 190 $ (109)