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Pension and postretirement benefits - Contributions to Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 29, 2024	Mar. 30, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023	Dec. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	$ 7	$ 0	$ 0	$ 10	$ 0
Total current year projected employer contributions	24			24
Expected future employer contributions, next fiscal year						$ 24
Previously Reported
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions, next fiscal year						$ 0
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	7	0	0	10	0
Total current year projected employer contributions	24			24
Nonpension postretirement
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	0	$ 0	$ 0	0	$ 0
Total current year projected employer contributions	$ 0			$ 0

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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