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Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 01, 2021
Oct. 02, 2020
Oct. 01, 2021
Oct. 02, 2020
Pension        
Net periodic benefit income        
Service cost $ 16 $ 17 $ 52 $ 49
Interest cost 47 68 139 205
Expected return on plan assets (155) (158) (467) (473)
Amortization of net actuarial loss (gain) 7 2 26 7
Amortization of prior service credit (cost) (7) (7) (21) (21)
Net loss from curtailments and settlements 7   4  
Contractual termination cost   0   1
Net periodic benefit income (85) (78) (267) (232)
Other Benefits        
Net periodic benefit income        
Service cost 1 0 2 1
Interest cost 1 3 4 7
Expected return on plan assets (5) (5) (15) (15)
Amortization of net actuarial loss (gain) 0 (1) 0 (2)
Amortization of prior service credit (cost) 1 0 1 0
Net loss from curtailments and settlements 0   0  
Contractual termination cost   0   0
Net periodic benefit income $ (2) $ (3) $ (8) $ (9)