v3.25.4
Derivative and Hedging Instruments - Reconciliation Of Accumulated Other Comprehensive Income (Loss) Related To Cash Flow Hedges (Details) - Cash flow hedges - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Accumulated other comprehensive income (loss) [Roll Forward]    
Accumulated other comprehensive income (loss), beginning of year $ 10 $ (149)
Hedging gains (losses) recognized in AOCI during the year 63 193
Reclassification from AOCI to income 127 34
Accumulated other comprehensive income (loss), end of year (54) 10
Reclassification adjustment related to de-designated hedges as hedged item affects income 0 0
Reclassification adjustment related to items for which the hedged future cash flows are no longer expected to occur 0 0
Interest rate risk    
Accumulated other comprehensive income (loss) [Roll Forward]    
Accumulated other comprehensive income (loss), beginning of year (2) 1
Hedging gains (losses) recognized in AOCI during the year 0 (3)
Reclassification from AOCI to income 0 0
Accumulated other comprehensive income (loss), end of year (2) (2)
Reclassification adjustment related to de-designated hedges as hedged item affects income 0 0
Reclassification adjustment related to items for which the hedged future cash flows are no longer expected to occur 0 0
Foreign exchange and interest rate risk    
Accumulated other comprehensive income (loss) [Roll Forward]    
Accumulated other comprehensive income (loss), beginning of year (64) (107)
Hedging gains (losses) recognized in AOCI during the year 8 (32)
Reclassification from AOCI to income 17 (75)
Accumulated other comprehensive income (loss), end of year (73) (64)
Reclassification adjustment related to de-designated hedges as hedged item affects income 0 0
Reclassification adjustment related to items for which the hedged future cash flows are no longer expected to occur 0 0
Foreign exchange translation risk    
Accumulated other comprehensive income (loss) [Roll Forward]    
Accumulated other comprehensive income (loss), beginning of year 0 3
Hedging gains (losses) recognized in AOCI during the year 0 23
Reclassification from AOCI to income 0 26
Accumulated other comprehensive income (loss), end of year 0 0
Reclassification adjustment related to de-designated hedges as hedged item affects income 0 0
Reclassification adjustment related to items for which the hedged future cash flows are no longer expected to occur 0 0
CPI risk    
Accumulated other comprehensive income (loss) [Roll Forward]    
Accumulated other comprehensive income (loss), beginning of year (42) (85)
Hedging gains (losses) recognized in AOCI during the year 5 60
Reclassification from AOCI to income 23 17
Accumulated other comprehensive income (loss), end of year (60) (42)
Reclassification adjustment related to de-designated hedges as hedged item affects income 0 0
Reclassification adjustment related to items for which the hedged future cash flows are no longer expected to occur 0 0
Equity risk    
Accumulated other comprehensive income (loss) [Roll Forward]    
Accumulated other comprehensive income (loss), beginning of year 118 39
Hedging gains (losses) recognized in AOCI during the year 50 145
Reclassification from AOCI to income 87 66
Accumulated other comprehensive income (loss), end of year 81 118
Reclassification adjustment related to de-designated hedges as hedged item affects income 0 0
Reclassification adjustment related to items for which the hedged future cash flows are no longer expected to occur $ 0 $ 0