Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans (Details)

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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 25, 2020
Sep. 27, 2019
Sep. 25, 2020
Sep. 27, 2019
Net periodic pension and other Postretirement benefit cost        
Contributions to pension plan     $ 25 $ 29
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 4   $ 4  
Pension Benefits        
Net periodic pension and other Postretirement benefit cost        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 7.50%   7.50%  
Service cost $ 28 $ 26 $ 84 78
Interest cost 58 73 176 218
Expected return on plan assets (148) (138) (440) (414)
Amortization of prior service cost (credit) 0 (1) 0 (3)
Amortization of net actuarial loss 43 38 128 114
Defined Benefit Plan Net Periodic Benefit Cost Excluding Settlement Curtailment and Special Termination Benefits (19) (2) (52) (7)
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment 0 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (19) (2) $ (52) (7)
Other Benefits        
Net periodic pension and other Postretirement benefit cost        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 4.50%   4.50%  
Service cost $ 2 2 $ 8 7
Interest cost 6 7 17 20
Expected return on plan assets (4) (3) (12) (10)
Amortization of prior service cost (credit) (1) (1) (2) (2)
Amortization of net actuarial loss 2 1 4 2
Defined Benefit Plan Net Periodic Benefit Cost Excluding Settlement Curtailment and Special Termination Benefits 5 6 15 17
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment 11 0 11 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 16 $ 6 $ 26 $ 17