Components of Net Periodic Benefit Cost for Pension and Retiree Medical Plans (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 21, 2015	Mar. 22, 2014
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 101	$ 91
Interest cost	126	134
Expected return on plan assets	(196)	(181)
Amortization of prior service (credit)/cost	(1)	5
Amortization of net losses/(gains)	47	40
Gross total	77	89
Special termination benefits	4	8
Total expense	81	97
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	19	19
Interest cost	22	24
Expected return on plan assets	(33)	(32)
Amortization of net losses/(gains)	14	9
Gross total	22	20
Total expense	22	20
Retiree Medical
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	8
Interest cost	12	14
Expected return on plan assets	(6)	(6)
Amortization of prior service (credit)/cost	(9)	(5)
Amortization of net losses/(gains)		(1)
Gross total	5	10
Special termination benefits	1
Total expense	$ 6	$ 10