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Pensions and other benefit plans - Schedule of Net Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022
Amounts Recognized in the Company’s Balance Sheet consist of the following: |  |  |
Non-current assets | $ 4,992 | $ 4,581 |
Current liabilities | (538) | (593) |
Non-current liabilities | (7,149) | (6,542) |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] |  |  |
Transferred to group annuity contract | 800 |  |
Retirement Plans |  |  |
Change in Benefit Obligation |  |  |
Projected benefit obligation - beginning of year | 29,390 | 41,272 |
Service cost | 893 | 1,319 | $ 1,412
Interest cost | 1,437 | 908 | 768
Plan participant contributions | 73 | 67 |
Amendments | (6) | 7 |
Actuarial (gains) losses | 2,068 | (12,159) |
Divestitures & acquisitions | (352) | 0 |
Curtailments, settlements & restructuring | (238) | (7) |
Benefits paid from plan | (2,122) | (1,220) |
Effect of exchange rates | 601 | (797) |
Projected benefit obligation - end of year | 31,744 | 29,390 | 41,272
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Plan assets at fair value — beginning of year | 31,496 | 41,909 |
Actual return on plan assets | 3,951 | (8,663) |
Company contributions | 268 | 261 |
Plan participant contributions | 73 | 67 |
Settlements | (176) | (5) |
Divestitures & acquisitions | (509) | 0 |
Benefits paid from plan assets | (2,122) | (1,220) |
Effect of exchange rates | 626 | (853) |
Plan assets at fair value - End of year | 33,607 | 31,496 | 41,909
Funded status - end of year | 1,863 | 2,106 |
Amounts Recognized in the Company’s Balance Sheet consist of the following: |  |  |
Non-current assets | 4,992 | 4,581 |
Current liabilities | (119) | (127) |
Non-current liabilities | (3,010) | (2,348) |
Total recognized in the consolidated balance sheet — end of year | 1,863 | 2,106 |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] |  |  |
Net actuarial loss | 4,962 | 3,948 |
Prior service cost (credit) | (1,236) | (1,417) |
Unrecognized net transition obligation | 0 | 0 |
Total before tax effects | 3,726 | 2,531 |
Accumulated Benefit Obligation | 30,139 | 27,797 |
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net periodic benefit cost (credit) | (676) | (62) | 607
Net actuarial (gain) loss | 711 | (793) |
Amortization of net actuarial loss | 199 | (655) |
Prior service cost (credit) | (2) | 7 |
Amortization of prior service (cost) credit | 185 | 183 |
Effect of exchange rates | 103 | (140) |
Total loss/(income) recognized in other comprehensive income, before tax | 1,195 | (1,398) |
Total recognized in net periodic benefit cost and other comprehensive income | 519 | (1,460) |
Other Benefit Plans |  |  |
Change in Benefit Obligation |  |  |
Projected benefit obligation - beginning of year | 4,192 | 4,874 |
Service cost | 264 | 320 | 309
Interest cost | 214 | 104 | 80
Plan participant contributions | 0 | 0 |
Amendments | 0 | 0 |
Actuarial (gains) losses | 469 | (704) |
Divestitures & acquisitions | 1 | 0 |
Curtailments, settlements & restructuring | (332) | 0 |
Benefits paid from plan | (702) | (393) |
Effect of exchange rates | 2 | (9) |
Projected benefit obligation - end of year | 4,108 | 4,192 | 4,874
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Plan assets at fair value — beginning of year | 78 | 102 |
Actual return on plan assets | 16 | (17) |
Company contributions | 694 | 386 |
Plan participant contributions | 0 | 0 |
Settlements | 0 | 0 |
Divestitures & acquisitions | 0 | 0 |
Benefits paid from plan assets | (702) | (393) |
Effect of exchange rates | 0 | 0 |
Plan assets at fair value - End of year | 86 | 78 | 102
Funded status - end of year | (4,022) | (4,114) |
Amounts Recognized in the Company’s Balance Sheet consist of the following: |  |  |
Non-current assets | 0 | 0 |
Current liabilities | (416) | (461) |
Non-current liabilities | (3,606) | (3,653) |
Total recognized in the consolidated balance sheet — end of year | (4,022) | (4,114) |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] |  |  |
Net actuarial loss | 354 | 239 |
Prior service cost (credit) | (6) | (7) |
Unrecognized net transition obligation | 0 |  |
Total before tax effects | 348 | 232 |
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net periodic benefit cost (credit) | 487 | 533 | $ 502
Net actuarial (gain) loss | 136 | (751) |
Amortization of net actuarial loss | (22) | (121) |
Prior service cost (credit) | 0 | 0 |
Amortization of prior service (cost) credit | 2 | 5 |
Effect of exchange rates | 0 | (1) |
Total loss/(income) recognized in other comprehensive income, before tax | 116 | (868) |
Total recognized in net periodic benefit cost and other comprehensive income | $ 603 | $ (335) |

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