Pension, Retiree Medical and Savings Plans (Components of Benefit Expense) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Domestic - Plan A [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement/curtailment losses/(gains) (a)			$ (205)
United States Pension Plan of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 487	$ 518	434
Interest cost	434	324	435
Expected return on plan assets	(912)	(970)	(929)
Amortization of prior service (credit)/cost	(28)	(31)	12
Amortization of net losses/(gains)	149	224	196
Settlement/curtailment losses/(gains) (a)	322	40	213
Special termination benefits	37	9	19
Defined Benefit Plan, Other Cost (Credit)	2	(404)	(54)
Total	$ 489	114	380
Pre-tax non-cash settlement charge, net of tax, per share	$ 0.18
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax	$ 246
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	318
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	64	104	86
Interest cost	90	74	85
Expected return on plan assets	(218)	(231)	(202)
Amortization of prior service (credit)/cost	(1)	(2)	0
Amortization of net losses/(gains)	29	77	61
Settlement/curtailment losses/(gains) (a)	1	(11)	19
Special termination benefits	0	0	0
Defined Benefit Plan, Other Cost (Credit)	(99)	(93)	(37)
Total	(35)	11	49
Retiree Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	37	33	25
Interest cost	19	15	25
Expected return on plan assets	(16)	(15)	(16)
Amortization of prior service (credit)/cost	(8)	(11)	(12)
Amortization of net losses/(gains)	(14)	(14)	(23)
Settlement/curtailment losses/(gains) (a)	(16)	0	0
Special termination benefits	0	0	0
Defined Benefit Plan, Other Cost (Credit)	(35)	(25)	(26)
Total	$ 2	$ 8	$ (1)
Defined benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Pre-tax non-cash settlement charge, net of tax, per share			$ 0.11
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax			$ 158