v3.26.1
RETIREMENT BENEFITS AND ASSETS HELD IN TRUST (Tables)
 6 Months Ended
Jun. 30, 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 EndedSix Months Ended
June 30,June 30,
(In millions of USD)2026202520262025
Service cost$3 $2 $5 $4 
Interest cost1 2 3 4 
Expected return on plan assets(3)(2)(5)(4)
Net periodic benefit cost$1 $2 $3 $4 
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 EndedSix Months Ended
June 30,June 30,
(In millions of USD)2026202520262025
Service cost$2 $2 $4 $4 
Interest cost2 2 3 3 
Expected return on plan assets(3)(2)(5)(4)
Amortization of unrecognized gain(1)(2)(2)(3)
Net postretirement cost$— $— $— $—