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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS
 9 Months Ended
Sep. 30, 2025
Postemployment Benefits [Abstract]  
PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS
NOTE 13 - PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS
Three months ended September 30,Nine months ended September 30,
2025202420252024
(in millions of U.S. dollars)PensionOPEB and Other BenefitsPensionOPEB and Other BenefitsPensionOPEB and Other BenefitsPensionOPEB and Other Benefits
Current service cost(4)(1)(4)(1)(13)(3)(13)(3)
Interest cost(6)(1)(7)(1)(17)(5)(19)(5)
Expected return on plan assets6 — 6 — 17 — 17 — 
Amortization of past service gain— 3 — 3 1 8 1 8 
Amortization of net actuarial gain— — — — — 1 — 1 
Total net pension and other long-term benefit cost(4)1 (5)1 (12)1 (14)1