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Retirement Plans
 3 Months Ended
Apr. 03, 2021
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans
We 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 Ended
(In millions)April 3,
2021		April 4,
2020
Pension Benefits
Service cost$29 $26 
Interest cost63 73 
Expected return on plan assets(144)(144)
Amortization of net actuarial loss39 46 
Amortization of prior service cost3 3 
Net periodic benefit cost (credit)$(10)$4 
Postretirement Benefits Other Than Pensions
Service cost$1 $1 
Interest cost1 2 
Amortization of net actuarial loss(1)— 
Amortization of prior service credit(1)(1)
Net periodic benefit cost$— $2