Pension, Retiree Medical and Savings Plans (Selected Financial Information for Pension and Retiree Medical Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Pension Plans, Defined Benefit
Change in fair value of plan assets
Employer contributions/funding	$ 364	$ 336	$ 738
Retiree Medical Plan
Change in projected benefit obligation
Obligation at beginning of year	714	954
Service cost	29	37	33
Interest cost	36	19	15
Plan amendments	0	0
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Experience loss/(gain)	(22)	(198)
Settlement/curtailment	0	(14)
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits	0	0
Other, including foreign currency adjustment	0	(3)
Obligation at end of year	677	714	954
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(80)	(81)
Change in fair value of plan assets
Fair value at beginning of year	196	299
Actual return on plan assets	21	(68)
Employer contributions/funding	46	48	47
Participant contributions	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(80)	(81)
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Other, including foreign currency adjustment	0	(2)
Fair value at end of year	183	196	299
Funded status	(494)	(518)
Amounts recognized
Other assets	0	0
Other current liabilities	(52)	(54)
Other liabilities	(442)	(464)
Net amount recognized	(494)	(518)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	(323)	(320)
Prior service cost/(credit)	(19)	(25)
Total	(342)	(345)
Changes recognized in net (gain)/loss included in other comprehensive loss
Net loss/(gain) arising in current year	(30)	(114)
Amortization and settlement recognition	27	14
Foreign currency translation loss/(gain)	0	0
Total	(3)	(100)
Special termination benefits	0	0	0
Domestic Plan
Change in projected benefit obligation
Obligation at beginning of year	11,543	16,216
Service cost	327	487	518
Interest cost	593	434	324
Plan amendments	13	10
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Experience loss/(gain)	603	(3,989)
Settlement/curtailment	(36)	(1,109)
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits	1
Other, including foreign currency adjustment	(1)	(131)
Obligation at end of year	12,035	11,543	16,216
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(1,006)	(412)
Change in fair value of plan assets
Fair value at beginning of year	11,148	15,904
Actual return on plan assets	1,121	(3,337)
Employer contributions/funding	314	235
Participant contributions	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(1,006)	(412)
Defined Benefit Plan, Plan Assets, Payment for Settlement	(36)	(1,117)
Other, including foreign currency adjustment	0	(125)
Fair value at end of year	11,541	11,148	15,904
Funded status	(494)	(395)
Amounts recognized
Other assets	313	225
Other current liabilities	(75)	(56)
Other liabilities	(732)	(564)
Net amount recognized	(494)	(395)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	3,596	3,337
Prior service cost/(credit)	18	(21)
Total	3,614	3,316
Changes recognized in net (gain)/loss included in other comprehensive loss
Net loss/(gain) arising in current year	333	254
Amortization and settlement recognition	(74)	(467)
Foreign currency translation loss/(gain)	0	0
Total	259	(213)
Accumulated benefit obligation at end of year	11,653	11,104
Special termination benefits		37	9
Foreign Plan [Member]
Change in projected benefit obligation
Obligation at beginning of year	2,603	4,175
Service cost	43	64	104
Interest cost	141	90	74
Plan amendments	0	0
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	2	2
Experience loss/(gain)	194	(1,284)
Settlement/curtailment	(26)	(5)
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits	0	0
Other, including foreign currency adjustment	145	(312)
Obligation at end of year	2,986	2,603	4,175
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(116)	(127)
Change in fair value of plan assets
Fair value at beginning of year	3,195	4,624
Actual return on plan assets	267	(1,026)
Employer contributions/funding	50	101
Participant contributions	2	2
Defined Benefit Plan, Plan Assets, Benefits Paid	(116)	(127)
Defined Benefit Plan, Plan Assets, Payment for Settlement	(26)	(5)
Other, including foreign currency adjustment	156	(374)
Fair value at end of year	3,528	3,195	4,624
Funded status	542	592
Amounts recognized
Other assets	727	708
Other current liabilities	(11)	(7)
Other liabilities	(174)	(109)
Net amount recognized	542	592
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	707	571
Prior service cost/(credit)	(8)	(9)
Total	699	562
Changes recognized in net (gain)/loss included in other comprehensive loss
Net loss/(gain) arising in current year	119	(40)
Amortization and settlement recognition	(23)	(30)
Foreign currency translation loss/(gain)	40	(55)
Total	136	(125)
Accumulated benefit obligation at end of year	2,835	2,483
Special termination benefits	$ 0	$ 0	$ 0