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Pension and postretirement benefits (Tables)
 6 Months Ended
Jun. 29, 2024
Retirement Benefits [Abstract]  
Components of Plan Benefit Expense
The following tables present the pension expense and nonpension postretirement income directly attributable to the Company for the quarter and year-to-date period ended June 29, 2024:
Pension
 Quarter endedYear-to-date period ended
(millions)June 29, 2024June 29, 2024
Service cost$2 $4 
Interest cost7 14 
Expected return on plan assets(9)(18)
Amortization of unrecognized prior service cost1 2 
Total pension expense$1 $2 
Other nonpension postretirement
 Quarter endedYear-to-date period ended
(millions)June 29, 2024June 29, 2024
Service cost$1 $2 
Interest cost6 12 
Expected return on plan assets(15)(30)
Amortization of unrecognized prior service cost(2)(4)
Total postretirement benefit income$(10)$(20)
Multiemployer Plan The following table summarizes the expenses that were allocated to the Company's plans prior to the Spin-Off:
Quarter endedYear-to-date period ended
(millions)July 1, 2023July 1, 2023
Pension plan:
   Shared plans (multiemployer)Cost allocation - COGS$2 $4 
Cost allocation - OIE— — 
Total pension expense$2 $4 
Nonpension postretirement plan:
   Shared plans (multiemployer)Cost allocation - COGS$1 $2 
Cost allocation - OIE(10)(20)
Total postretirement benefit income$(9)$(18)
Contributions to Employee Benefit Plans
Company contributions to employee benefit plans are summarized as follows:

(millions)PensionNonpension postretirementTotal
Quarter ended:
June 29, 2024$7 $— $7 
July 1, 2023$— $— $— 
Year-to-date period ended:
June 29, 2024$10 $— $10 
July 1, 2023$— $— $— 
Full year:
Fiscal year 2024 (projected) (a)
$24 $— $24 
Fiscal year 2023 (actual)$— $— $— 
(a)Projected 2024 amounts have been corrected from $0 million as previously disclosed in our 2023 Annual Report to $24 million.