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Retirement Plans
6 Months Ended
Jul. 03, 2021
Retirement Benefits [Abstract]  
Retirement Plans Retirement PlansWe provide defined benefit pension plans and other postretirement benefits to eligible employees.  The components of net periodic benefit cost (credit) for these plans are as follows:
Three Months EndedSix Months Ended
(In millions)July 3,
2021
July 4,
2020
July 3,
2021
July 4,
2020
Pension Benefits
Service cost$29 $26 $58 $52 
Interest cost63 74 126 147 
Expected return on plan assets(144)(143)(288)(287)
Amortization of net actuarial loss38 46 77 92 
Amortization of prior service cost
Net periodic benefit cost (credit)*$(11)$$(21)$10 
Postretirement Benefits Other Than Pensions
Service cost$— $$$
Interest cost
Amortization of net actuarial gain— — (1)— 
Amortization of prior service credit(1)(2)(2)(3)
Net periodic benefit cost$$$$