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	Dec. 28, 2019
Pension Plans, Defined Benefit
Change in fair value of plan assets
Employer contributions/funding		$ 738	$ 507	$ 672
Retiree Medical Plan
Change in projected benefit obligation
Obligation at beginning of year	$ 954	1,006	988
Service cost		33	25	23
Interest cost		15	25	36
Plan amendments		0	(25)
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		0	0
Experience (gain)/loss		(17)	81
Settlement/curtailment		0	0
Special termination benefits		0	0
Other, including foreign currency adjustment		0	1
Obligation at end of year		954	1,006	988
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(83)	(89)
Change in fair value of plan assets
Fair value at beginning of year	299	315	302
Actual return on plan assets		20	47
Employer contributions/funding		47	55	44
Participant contributions		0	0
Defined Benefit Plan, Plan Assets, Benefits Paid		(83)	(89)
Defined Benefit Plan, Plan Assets, Payment for Settlement		0	0
Other, including foreign currency adjustment		0	0
Fair value at end of year		299	315	302
Funded status		(655)	(691)
Amounts recognized
Other assets		0	0
Other current liabilities		(57)	(51)
Other liabilities		(598)	(640)
Net amount recognized		(655)	(691)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)		(220)	(212)
Prior service (credit)/cost		(34)	(45)
Total		(254)	(257)
Changes recognized in net (gain)/loss included in other comprehensive loss
Net (gain)/loss arising in current year		(22)	50
Amortization and settlement recognition		14	23
Foreign currency translation (gain)/loss		0	0
Total		(8)	73
Domestic Plan [Member]
Change in projected benefit obligation
Obligation at beginning of year	16,216	16,753	15,230
Service cost		518	434	381
Interest cost		324	435	543
Plan amendments		23	(221)
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		0	0
Experience (gain)/loss		(215)	2,042
Settlement/curtailment		(220)	(808)
Special termination benefits		9	19
Other, including foreign currency adjustment		0	0
Obligation at end of year		16,216	16,753	15,230
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(976)	(378)
Change in fair value of plan assets
Fair value at beginning of year	15,904	15,465	14,302
Actual return on plan assets		1,052	1,908
Employer contributions/funding		580	387
Participant contributions		0	0
Defined Benefit Plan, Plan Assets, Benefits Paid		(976)	(378)
Defined Benefit Plan, Plan Assets, Payment for Settlement		(217)	(754)
Other, including foreign currency adjustment		0	0
Fair value at end of year		15,904	15,465	14,302
Funded status		(312)	(1,288)
Amounts recognized
Other assets		692	797
Other current liabilities		(48)	(53)
Other liabilities		(956)	(2,032)
Net amount recognized		(312)	(1,288)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)		3,550	4,116
Prior service (credit)/cost		(63)	(119)
Total		3,487	3,997
Changes recognized in net (gain)/loss included in other comprehensive loss
Net (gain)/loss arising in current year		(301)	1,009
Amortization and settlement recognition		(265)	(409)
Foreign currency translation (gain)/loss		0	0
Total		(566)	600
Accumulated benefit obligation at end of year		15,489	15,949
Foreign Plan [Member]
Change in projected benefit obligation
Obligation at beginning of year	4,175	4,430	3,753
Service cost		104	86	73
Interest cost		74	85	97
Plan amendments		3	(17)
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		3	2
Experience (gain)/loss		(178)	467
Settlement/curtailment		(99)	(24)
Special termination benefits		0	0
Other, including foreign currency adjustment		(56)	170
Obligation at end of year		4,175	4,430	3,753
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(106)	(92)
Change in fair value of plan assets
Fair value at beginning of year	4,624	4,303	3,732
Actual return on plan assets		387	401
Employer contributions/funding		158	120
Participant contributions		3	2
Defined Benefit Plan, Plan Assets, Benefits Paid		(106)	(92)
Defined Benefit Plan, Plan Assets, Payment for Settlement		(52)	(29)
Other, including foreign currency adjustment		(69)	169
Fair value at end of year		4,624	4,303	$ 3,732
Funded status		449	(127)
Amounts recognized
Other assets		564	110
Other current liabilities		(1)	(1)
Other liabilities		(114)	(236)
Net amount recognized		449	(127)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)		696	1,149
Prior service (credit)/cost		(11)	(19)
Total		685	1,130
Changes recognized in net (gain)/loss included in other comprehensive loss
Net (gain)/loss arising in current year		(355)	268
Amortization and settlement recognition		(95)	(75)
Foreign currency translation (gain)/loss		(3)	42
Total		(453)	235
Accumulated benefit obligation at end of year		$ 4,021	$ 4,108
Forecast [Member] | Domestic Plan [Member]
Change in fair value of plan assets
Employer contributions/funding	$ 75