Pension And Retiree Medical Benefits (Components Of Benefit Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 24, 2012	Mar. 19, 2011
Defined Benefit Plan Disclosure [Line Items]
Discretionary, pension contributions	$ 860
Retiree medical plans	140
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	95	82
Interest cost	123	126
Expected return on plan assets	(184)	(162)
Amortization of prior service cost/(benefit)	4	3
Amortization of experience loss	60	33
Gross total	98	82
Curtailment gain	(7)	(9)
Special termination benefits	4	10
Total expense	95	83
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	18	17
Interest cost	20	21
Expected return on plan assets	(26)	(24)
Amortization of experience loss	10	7
Gross total	22	21
Total expense	22	21
Retiree Medical [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	12	12
Interest cost	15	20
Expected return on plan assets	(5)	(3)
Amortization of prior service cost/(benefit)	(6)	(7)
Amortization of experience loss		3
Gross total	16	25
Special termination benefits	4	1
Total expense	$ 20	$ 26