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Pension and postretirement benefits (Tables) | 6 Months Ended
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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 ended | Year-to-date period ended
(millions) | June 29, 2024 | June 29, 2024
Service cost | $ | 2 |  | $ | 4 |
Interest cost | 7 |  | 14 |
Expected return on plan assets | (9) |  | (18) |
Amortization of unrecognized prior service cost | 1 |  | 2 |
Total pension expense | $ | 1 |  | $ | 2 |
Other nonpension postretirement
| Quarter ended |  | Year-to-date period ended
(millions) | June 29, 2024 |  |  | June 29, 2024 |
Service cost | $ | 1 |  |  |  | $ | 2 |  |
Interest cost | 6 |  |  |  | 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 ended | Year-to-date period ended
(millions) |  | July 1, 2023 | July 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) | Pension | Nonpension postretirement | Total
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.

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