Pensions and other benefit plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 29, 2026 |
Mar. 30, 2025 |
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| Retirement Plans | ||
| Components of net periodic benefit cost | ||
| Service cost | $ 236 | $ 214 |
| Interest cost | 360 | 351 |
| Expected return on plan assets | (639) | (587) |
| Amortization of prior service cost/(credit) | (46) | (46) |
| Recognized actuarial (gains)/losses | 69 | 83 |
| Net periodic benefit cost/(credit) | (20) | 15 |
| Other Benefit Plans | ||
| Components of net periodic benefit cost | ||
| Service cost | 80 | 72 |
| Interest cost | 52 | 54 |
| Expected return on plan assets | (2) | (2) |
| Amortization of prior service cost/(credit) | 0 | 0 |
| Recognized actuarial (gains)/losses | 26 | 16 |
| Net periodic benefit cost/(credit) | $ 156 | $ 140 |
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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