v3.26.3
RETIREMENT BENEFITS AND ASSETS HELD IN TRUST (Tables)
 9 Months Ended
Sep. 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 EndedNine Months Ended
September 30,September 30,
(In millions of USD)2026202520262025
Service cost$2 $2 $7 $6 
Interest cost2 1 5 5 
Expected return on plan assets(2)(2)(7)(6)
Net periodic benefit cost$2 $1 $5 $5 
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 EndedNine Months Ended
September 30,September 30,
(In millions of USD)2026202520262025
Service cost$2 $1 $6 $5 
Interest cost2 2 5 5 
Expected return on plan assets(2)(2)(7)(6)
Amortization of unrecognized gain(2)(1)(4)(4)
Net postretirement cost$— $— $— $—