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Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 02, 2021
Jul. 03, 2020
Jul. 02, 2021
Jul. 03, 2020
Pension        
Net periodic benefit income        
Service cost $ 18 $ 16 $ 36 $ 32
Interest cost 46 68 92 137
Expected return on plan assets (157) (157) (312) (315)
Amortization of net actuarial loss 10 3 19 5
Amortization of prior service credit (7) (7) (14) (14)
Net gain from curtailments and settlements (3)   (3)  
Contractual termination cost   0   1
Net periodic benefit income (93) (77) (182) (154)
Other Benefits        
Net periodic benefit income        
Service cost 0 1 1 1
Interest cost 2 2 3 4
Expected return on plan assets (5) (5) (10) (10)
Amortization of net actuarial loss 0 (1) 0 (1)
Amortization of prior service credit 0 0 0 0
Net gain from curtailments and settlements 0   0  
Contractual termination cost   0   0
Net periodic benefit income $ (3) $ (3) $ (6) $ (6)