Pension, Retiree Medical and Savings Plans (Selected Financial Information for Pension and Retiree Medical Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Pension Plans, Defined Benefit
Change in fair value of plan assets
Employer contributions/funding	$ 336	$ 738	$ 507
Retiree Medical Plan
Change in projected benefit obligation
Obligation at beginning of year	954	1,006
Service cost	37	33	25
Interest cost	19	15	25
Plan amendments	0	0
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Experience gain	(198)	(17)
Settlement/curtailment	(14)	0
Special termination benefits	0	0
Other, including foreign currency adjustment	(3)	0
Obligation at end of year	714	954	1,006
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(81)	(83)
Change in fair value of plan assets
Fair value at beginning of year	299	315
Actual return on plan assets	(68)	20
Employer contributions/funding	48	47	55
Participant contributions	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(81)	(83)
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Other, including foreign currency adjustment	(2)	0
Fair value at end of year	196	299	315
Funded status	(518)	(655)
Amounts recognized
Other assets	0	0
Other current liabilities	(54)	(57)
Other liabilities	(464)	(598)
Net amount recognized	(518)	(655)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	(320)	(220)
Prior service credit	(25)	(34)
Total	(345)	(254)
Changes recognized in net (gain)/loss included in other comprehensive loss
Net loss/(gain) arising in current year	(114)	(22)
Amortization and settlement recognition	14	14
Foreign currency translation gain	0	0
Total	(100)	(8)
Domestic Plan [Member]
Change in projected benefit obligation
Obligation at beginning of year	16,216	16,753
Service cost	487	518	434
Interest cost	434	324	435
Plan amendments	10	23
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Experience gain	(3,989)	(215)
Settlement/curtailment	(1,109)	(220)
Special termination benefits	37	9
Other, including foreign currency adjustment	(131)	0
Obligation at end of year	11,543	16,216	16,753
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(412)	(976)
Change in fair value of plan assets
Fair value at beginning of year	15,904	15,465
Actual return on plan assets	(3,337)	1,052
Employer contributions/funding	235	580
Participant contributions	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(412)	(976)
Defined Benefit Plan, Plan Assets, Payment for Settlement	(1,117)	(217)
Other, including foreign currency adjustment	(125)	0
Fair value at end of year	11,148	15,904	15,465
Funded status	(395)	(312)
Amounts recognized
Other assets	225	692
Other current liabilities	(56)	(48)
Other liabilities	(564)	(956)
Net amount recognized	(395)	(312)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	3,337	3,550
Prior service credit	(21)	(63)
Total	3,316	3,487
Changes recognized in net (gain)/loss included in other comprehensive loss
Net loss/(gain) arising in current year	254	(301)
Amortization and settlement recognition	(467)	(265)
Foreign currency translation gain	0	0
Total	(213)	(566)
Accumulated benefit obligation at end of year	11,104	15,489
Foreign Plan [Member]
Change in projected benefit obligation
Obligation at beginning of year	4,175	4,430
Service cost	64	104	86
Interest cost	90	74	85
Plan amendments	0	3
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	2	3
Experience gain	(1,284)	(178)
Settlement/curtailment	(5)	(99)
Special termination benefits	0	0
Other, including foreign currency adjustment	(312)	(56)
Obligation at end of year	2,603	4,175	4,430
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(127)	(106)
Change in fair value of plan assets
Fair value at beginning of year	4,624	4,303
Actual return on plan assets	(1,026)	387
Employer contributions/funding	101	158
Participant contributions	2	3
Defined Benefit Plan, Plan Assets, Benefits Paid	(127)	(106)
Defined Benefit Plan, Plan Assets, Payment for Settlement	(5)	(52)
Other, including foreign currency adjustment	(374)	(69)
Fair value at end of year	3,195	4,624	$ 4,303
Funded status	592	449
Amounts recognized
Other assets	708	564
Other current liabilities	(7)	(1)
Other liabilities	(109)	(114)
Net amount recognized	592	449
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	571	696
Prior service credit	(9)	(11)
Total	562	685
Changes recognized in net (gain)/loss included in other comprehensive loss
Net loss/(gain) arising in current year	(40)	(355)
Amortization and settlement recognition	(30)	(95)
Foreign currency translation gain	(55)	(3)
Total	(125)	(453)
Accumulated benefit obligation at end of year	$ 2,483	$ 4,021