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Pensions and Other Benefit Plans (Tables)
 9 Months Ended
Oct. 03, 2021
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost Net periodic benefit costs for the Company’s defined benefit retirement plans and other benefit plans include the following components:
Fiscal Third Quarter EndedFiscal Nine Months Ended
 Retirement PlansOther Benefit PlansRetirement PlansOther Benefit Plans
(Dollars in Millions)October 3, 2021September 27, 2020October 3, 2021September 27, 2020October 3, 2021September 27, 2020October 3, 2021September 27, 2020
Service cost$339 330 78 72 1,019 979 232 216 
Interest cost192 238 20 33 578 715 61 99 
Expected return on plan assets(661)(617)(1)(2)(1,988)(1,839)(5)(5)
Amortization of prior service cost/(credit)(46)— (8)(7)(136)1 (23)(23)
Recognized actuarial losses314 224 38 36 944 669 113 107 
Curtailments and settlements— — — — 1 19 — — 
Net periodic benefit cost$138 175 127 132 418 544 378 394