v3.26.1
RETIREMENT BENEFITS AND ASSETS HELD IN TRUST (Tables)
 3 Months Ended
Mar. 31, 2026
Pension plans  
Defined Benefit Plan Disclosure [Line Items]  
Net Defined Benefit Cost Components
Net periodic benefit cost for the pension plans, by component, was as follows:
Three Months Ended
March 31,
(In millions of USD)20262025
Service cost$2 $2 
Interest cost2 2 
Expected return on plan assets(2)(2)
Net periodic benefit cost$2 $2 
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
Net Defined Benefit Cost Components
Net postretirement benefit plan cost, by component, was as follows:
Three Months Ended
March 31,
(In millions of USD)20262025
Service cost$2 $2 
Interest cost1 1 
Expected return on plan assets(2)(2)
Amortization of unrecognized gain(1)(1)
Net postretirement cost$— $—