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Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 03, 2020
Jun. 28, 2019
Jul. 03, 2020
Jun. 28, 2019
Pension        
Net periodic benefit income        
Service cost $ 16 $ 9 $ 32 $ 18
Interest cost 68 52 137 104
Expected return on plan assets (157) (96) (315) (191)
Amortization of net actuarial loss (gain) 3 0 5 0
Amortization of prior service credit (7)   (14)  
Contractual termination benefits and effect of curtailments or settlements 0 1 1 1
Net periodic benefit income (77) (34) (154) (68)
Other Benefits        
Net periodic benefit income        
Service cost 1 (1) 1 0
Interest cost 2 2 4 4
Expected return on plan assets (5) (4) (10) (8)
Amortization of net actuarial loss (gain) (1) (1) (1) (3)
Amortization of prior service credit 0   0  
Contractual termination benefits and effect of curtailments or settlements 0 0 0 0
Net periodic benefit income $ (3) $ (4) $ (6) $ (7)