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Retirement Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 03, 2022
Jul. 04, 2021
Jul. 03, 2022
Jul. 04, 2021
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 26 $ 29 $ 52 $ 59
Interest cost 100 90 200 180
Expected return on plan assets (227) (241) (455) (482)
Net actuarial loss (gain) 53 80 107 183
Prior service (credit) cost (5) (5) (10) (10)
Net periodic benefit credit (53) (47) (106) (70)
Other Post-retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2 3 3 5
Interest cost 5 4 10 9
Expected return on plan assets (8) (9) (16) (18)
Net actuarial loss (gain) (5) 0 (9) 0
Prior service (credit) cost 1 0 1 0
Net periodic benefit credit $ (5) $ (2) $ (11) $ (4)