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Pension and Retiree Medical Benefits Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 20, 2021
Mar. 21, 2020
Domestic Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer, Discretionary $ 300 $ 150
Defined Benefit Plan, Service Cost 120 100
Defined Benefit Plan, Interest Cost 75 100
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (224) (214)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (7) 3
Defined Benefit Plan, Amortization of Gain (Loss) 51 45
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits 6 6
Defined Benefit Plan, Other Cost (Credit) (99) (60)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 21 40
Foreign Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer, Discretionary 25  
Defined Benefit Plan, Service Cost 19 17
Defined Benefit Plan, Interest Cost 13 16
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (41) (37)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0
Defined Benefit Plan, Amortization of Gain (Loss) 13 10
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits 0 0
Defined Benefit Plan, Other Cost (Credit) (15) (11)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 4 6
Retiree Medical Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost 8 6
Defined Benefit Plan, Interest Cost 3 6
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (4) (4)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (2) (3)
Defined Benefit Plan, Amortization of Gain (Loss) (3) (5)
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits 0 0
Defined Benefit Plan, Other Cost (Credit) (6) (6)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 2 $ 0