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Postretirement benefits
 6 Months Ended
Jun. 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 June 30U.S. PlansNon-U.S. PlansU.S. PlansNon-U.S. Plans
(in millions of U.S. dollars)
Service cost$— $3 $— $2 $— $— 
Non-service cost (benefit):
Interest cost34 9 34 9 — 1 
Expected return on plan assets(61)(12)(56)(13)(1)(1)
Amortization of net actuarial (gain) loss(1)— — — — — 
Amortization of prior service cost— — — — — — 
Settlements— — — — — — 
Total non-service cost (benefit)(28)(3)(22)(4)(1)— 
Net periodic benefit cost (benefit)$(28)$— $(22)$(2)$(1)$— 

Pension Benefit PlansOther Postretirement Benefit Plans
2024202320242023
Six Months Ended June 30U.S. PlansNon-U.S. PlansU.S. PlansNon-U.S. Plans
(in millions of U.S. dollars)
Service cost:$— $5 $— $4 $— $— 
Non-service cost (benefit):
Interest cost67 18 68 18 1 1 
Expected return on plan assets(122)(25)(112)(25)(2)(2)
Amortization of net actuarial (gain) loss(1)1 — — (1)— 
Amortization of prior service cost— — — — — — 
Settlements— — — — — — 
Total non-service cost (benefit)(56)(6)(44)(7)(2)(1)
Net periodic benefit cost (benefit)$(56)$(1)$(44)$(3)$(2)$(1)
The line items in which the service cost and non-service cost (benefit) components of net periodic cost (benefit) are included in the Consolidated statements of operations were as follows:
Pension Benefit PlansOther Postretirement
Benefit Plans
Three Months Ended June 302024202320242023
(in millions of U.S. dollars)
Service cost:
Losses and loss expenses$— $— $— $— 
Administrative expenses3 2 —— 
Total service cost3 2——
Non-service cost (benefit):
Losses and loss expenses(3)(3)——
Administrative expenses(28)(23)(1)— 
Total non-service cost (benefit)(31)(26)(1)— 
Net periodic benefit cost (benefit)$(28)$(24)$(1)$— 

Pension Benefit PlansOther Postretirement
Benefit Plans
Six Months Ended June 302024202320242023
(in millions of U.S. dollars)
Service cost:
Losses and loss expenses$— $— $— $— 
Administrative expenses54 ——
Total service cost54 ——
Non-service cost (benefit):
Losses and loss expenses(6)(5)——
Administrative expenses(56)(46)(2)(1)
Total non-service cost (benefit)(62)(51)(2)(1)
Net periodic benefit cost (benefit)$(57)$(47)$(2)$(1)