v3.26.1
PREFERRED LIMITED PARTNERS' EQUITY - Narrative (Details)
$ / shares in Units, $ in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2025
Jun. 30, 2026
USD ($)
shares
Mar. 31, 2026
CAD ($)
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2026
CAD ($)
$ / shares
shares
Preferred limited partners' equity              
Disclosure of classes of share capital [line items]              
Dividends paid | $   $ 8   $ 9 $ 15 $ 17  
Number of shares outstanding (in shares) | shares             32,000,000.00
Series 7 (C$175)              
Disclosure of classes of share capital [line items]              
Payments to acquire or redeem entity's shares | $     $ 175        
Number of shares outstanding (in shares) | shares             0
Carrying value | $             $ 175
Cumulative distribution rate (%)         0.00%    
Series 19 (C$200)              
Disclosure of classes of share capital [line items]              
Number of shares outstanding (in shares) | shares             8,000,000
Share price (in canadian dollars per share) | $ / shares             $ 25
Carrying value | $             $ 200
Cumulative distribution rate (%)         5.75%    
Class A Preferred Limited Partnership Units              
Disclosure of classes of share capital [line items]              
Percent of public float allowable for repurchase 10.00%            
Repurchase of shares (in shares) | shares   0   0 0 0