v3.26.3
REDEEMABLE NONCONTROLLING INTERESTS - Changes in Redeemable NCI (Details) - CAD ($)
$ in Millions
9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Redeemable Noncontrolling Interest [Line Items]    
Balance at beginning of period $ 736  
Balance at end of period 1,433 $ 736
Class A Units    
Redeemable Noncontrolling Interest [Line Items]    
Balance at beginning of period 736 0
Proceeds from investment by redeemable noncontrolling interest in subsidiary 0 736
Transaction costs, net of tax benefit 0 (27)
Earnings attributable to redeemable noncontrolling interest 41 16
Distributions declared to unitholder (51) (17)
Contributions from unitholder 16 0
Redemption value adjustment (6) 28
Balance at end of period 736 736
Class II Units    
Redeemable Noncontrolling Interest [Line Items]    
Balance at beginning of period 0 0
Proceeds from investment by redeemable noncontrolling interest in subsidiary 729 0
Transaction costs, net of tax benefit (22) 0
Other (10) 0
Balance at end of period $ 697 $ 0