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Postretirement benefits (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block] Postretirement benefits
The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows:
Pension Benefit PlansOther Postretirement
Benefit Plans
2025202420252024
Three Months Ended September 30U.S. PlansNon-U.S. PlansU.S. PlansNon-U.S. Plans
(in millions of U.S. dollars)
Service cost$— $2 $— $2 $— $— 
Non-service cost (benefit):
Interest cost34 9 33 9 — — 
Expected return on plan assets(62)(15)(61)(13)(1)— 
Amortization of net actuarial (gain) loss(2)1 — — — (1)
Amortization of prior service cost— — — — — — 
Settlements— — 1 — — — 
Total non-service cost (benefit)(30)(5)(27)(4)(1)(1)
Net periodic benefit cost (benefit)$(30)$(3)$(27)$(2)$(1)$(1)

Pension Benefit PlansOther Postretirement Benefit Plans
2025202420252024
Nine Months Ended September 30U.S. PlansNon-U.S. PlansU.S. PlansNon-U.S. Plans
(in millions of U.S. dollars)
Service cost$— $6 $— $7 $— $— 
Non-service cost (benefit):
Interest cost101 27 100 27 1 1 
Expected return on plan assets(187)(42)(183)(38)(2)(2)
Amortization of net actuarial (gain) loss(6)1 (1)1 (2)(2)
Amortization of prior service cost— — — — — — 
Settlements— — 1 — — — 
Total non-service cost (benefit)(92)(14)(83)(10)(3)(3)
Net periodic benefit cost (benefit)$(92)$(8)$(83)$(3)$(3)$(3)
The line items in which the service cost and non-service cost (benefit) components of net periodic cost (benefit) are included in the Consolidated statements of operations were as follows:
Pension Benefit PlansOther Postretirement
Benefit Plans
Three Months Ended September 302025202420252024
(in millions of U.S. dollars)
Service cost:
Losses and loss expenses$— $— $— $— 
Administrative expenses2 2 —— 
Total service cost2 2——
Non-service cost (benefit):
Losses and loss expenses(3)(3)——
Administrative expenses(32)(28)(1)(1)
Total non-service cost (benefit)(35)(31)(1)(1)
Net periodic benefit cost (benefit)$(33)$(29)$(1)$(1)
Pension Benefit PlansOther Postretirement
Benefit Plans
Nine Months Ended September 302025202420252024
(in millions of U.S. dollars)
Service cost:
Losses and loss expenses$— $— $— $— 
Administrative expenses67 ——
Total service cost67 ——
Non-service cost (benefit):
Losses and loss expenses(10)(9)——
Administrative expenses(96)(84)(3)(3)
Total non-service cost (benefit)(106)(93)(3)(3)
Net periodic benefit cost (benefit)$(100)$(86)$(3)$(3)