Benefits Plans (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 05, 2015	Jun. 29, 2014	Jul. 05, 2015	Jun. 29, 2014
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 57	$ 48	$ 114	$ 96
Interest cost	133	133	266	266
Expected return on plan assets	(174)	(164)	(348)	(328)
Recognized net actuarial loss	109	74	219	148
Amortization of prior service (credit) cost	(17)	(17)	(34)	(34)
Net periodic cost	108	74	217	148
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	6	6
Interest cost	11	13	22	26
Expected return on plan assets	(8)	(8)	(16)	(16)
Recognized net actuarial loss	1	3	3	5
Amortization of prior service (credit) cost	(1)	(1)	(2)	(1)
Net periodic cost	$ 6	$ 10	$ 13	$ 20