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Postretirement benefits
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Compensation and Employee Benefit Plans [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
2024202320242023
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 $— $— 
Non-service cost (benefit):
Interest cost33 9 35 9 — 1 
Expected return on plan assets(61)(13)(56)(13)— — 
Amortization of net actuarial (gain) loss— — — — (1)(1)
Amortization of prior service cost— — — — — (1)
Settlements1 — 3 — — — 
Total non-service cost (benefit)(27)(4)(18)(4)(1)(1)
Net periodic benefit cost (benefit)$(27)$(2)$(18)$(2)$(1)$(1)

Pension Benefit PlansOther Postretirement Benefit Plans
2024202320242023
Nine Months Ended September 30U.S. PlansNon-U.S. PlansU.S. PlansNon-U.S. Plans
(in millions of U.S. dollars)
Service cost:$— $7 $— $6 $— $— 
Non-service cost (benefit):
Interest cost100 27 103 27 1 2 
Expected return on plan assets(183)(38)(168)(38)(2)(2)
Amortization of net actuarial (gain) loss(1)1 — — (2)(1)
Amortization of prior service cost— — — — — (1)
Settlements1 — 3 — — — 
Total non-service cost (benefit)(83)(10)(62)(11)(3)(2)
Net periodic benefit cost (benefit)$(83)$(3)$(62)$(5)$(3)$(2)
The line items in which the service cost and non-service cost (benefit) components of net periodic cost (benefit) are included in the Consolidated statements of operations were as follows:
Pension Benefit PlansOther Postretirement
Benefit Plans
Three Months Ended September 302024202320242023
(in millions of U.S. dollars)
Service cost:
Losses and loss expenses$— $— $— $— 
Administrative expenses2 2 —— 
Total service cost2 2——
Non-service cost (benefit):
Losses and loss expenses(3)(1)——
Administrative expenses(28)(21)(1)(1)
Total non-service cost (benefit)(31)(22)(1)(1)
Net periodic benefit cost (benefit)$(29)$(20)$(1)$(1)

Pension Benefit PlansOther Postretirement
Benefit Plans
Nine Months Ended September 302024202320242023
(in millions of U.S. dollars)
Service cost:
Losses and loss expenses$— $— $— $— 
Administrative expenses76 ——
Total service cost76 ——
Non-service cost (benefit):
Losses and loss expenses(9)(6)— —
Administrative expenses(84)(67)(3)(2)
Total non-service cost (benefit)(93)(73)(3)(2)
Net periodic benefit cost (benefit)$(86)$(67)$(3)$(2)