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Postretirement benefits (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
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 June 30U.S. PlansNon-U.S. PlansU.S. PlansNon-U.S. Plans
(in millions of U.S. dollars)
Service cost$— $2 $— $3 $— $— 
Non-service cost (benefit):
Interest cost33 9 34 9 1 — 
Expected return on plan assets(62)(14)(61)(12)(1)(1)
Amortization of net actuarial (gain) loss(2)— (1)— (1)— 
Amortization of prior service cost— — — — — — 
Settlements— — — — — — 
Total non-service cost (benefit)(31)(5)(28)(3)(1)(1)
Net periodic benefit cost (benefit)$(31)$(3)$(28)$— $(1)$(1)

Pension Benefit PlansOther Postretirement Benefit Plans
2025202420252024
Six Months Ended June 30U.S. PlansNon-U.S. PlansU.S. PlansNon-U.S. Plans
(in millions of U.S. dollars)
Service cost$— $4 $— $5 $— $— 
Non-service cost (benefit):
Interest cost67 18 67 18 1 1 
Expected return on plan assets(125)(27)(122)(25)(1)(2)
Amortization of net actuarial (gain) loss(4)— (1)1 (2)(1)
Amortization of prior service cost— — — — — — 
Settlements— — — — — — 
Total non-service cost (benefit)(62)(9)(56)(6)(2)(2)
Net periodic benefit cost (benefit)$(62)$(5)$(56)$(1)$(2)$(2)
The line items in which the service cost and non-service cost (benefit) components of net periodic cost (benefit) are included in the Consolidated statements of operations were as follows:
Pension Benefit PlansOther Postretirement
Benefit Plans
Three Months Ended June 302025202420252024
(in millions of U.S. dollars)
Service cost:
Losses and loss expenses$— $— $— $— 
Administrative expenses2 3 —— 
Total service cost2 3——
Non-service cost (benefit):
Losses and loss expenses(4)(3)——
Administrative expenses(32)(28)(1)(1)
Total non-service cost (benefit)(36)(31)(1)(1)
Net periodic benefit cost (benefit)$(34)$(28)$(1)$(1)
Pension Benefit PlansOther Postretirement
Benefit Plans
Six Months Ended June 302025202420252024
(in millions of U.S. dollars)
Service cost:
Losses and loss expenses$— $— $— $— 
Administrative expenses45 ——
Total service cost45 ——
Non-service cost (benefit):
Losses and loss expenses(7)(6)——
Administrative expenses(64)(56)(2)(2)
Total non-service cost (benefit)(71)(62)(2)(2)
Net periodic benefit cost (benefit)$(67)$(57)$(2)$(2)