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Pension, Retiree Medical and Savings Plans (Components of Benefit Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Domestic - Plan A [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Settlement/curtailment losses (a) $ 220    
United States Pension Plan of US Entity, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 381 $ 431 $ 401
Interest cost 543 482 468
Expected return on plan assets (892) (943) (849)
Amortization of prior service cost/(credits) 10 3 1
Amortization of net losses/(gains) 161 179 123
Settlement/curtailment losses (a) 296 8 8
Special termination benefits 1 36 60
Defined Benefit Plan, Other Cost (Credit) 119 (235) (189)
Total 500 196 212
International      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 73 92 91
Interest cost 97 93 89
Expected return on plan assets (188) (197) (176)
Amortization of net losses/(gains) 32 45 53
Settlement/curtailment losses (a) 12 6 11
Special termination benefits   2  
Defined Benefit Plan, Other Cost (Credit) (47) (51) (23)
Total 26 41 68
Retiree Medical Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 23 32 28
Interest cost 36 34 36
Expected return on plan assets (18) (19) (22)
Amortization of prior service cost/(credits) (19) (20) (25)
Amortization of net losses/(gains) (27) (8) (12)
Special termination benefits   1 2
Defined Benefit Plan, Other Cost (Credit) (28) (12) (21)
Total (5) $ 20 $ 7
Domestic-Plan I [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Settlement/curtailment losses (a) $ 53