Retirement Plans Benefits Plans (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2016	Jul. 05, 2015	Jul. 03, 2016	Jul. 05, 2015
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 44	$ 57	$ 88	$ 114
Interest cost	114	133	228	266
Expected return on plan assets	(178)	(174)	(356)	(348)
Recognized net actuarial loss (gain)	84	109	168	219
Amortization of prior service credit	(17)	(17)	(34)	(34)
Net periodic benefit cost	47	108	94	217
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	3	5	6
Interest cost	9	11	17	22
Expected return on plan assets	(8)	(8)	(16)	(16)
Recognized net actuarial loss (gain)	(1)	1	(2)	3
Amortization of prior service credit	(1)	(1)	(3)	(2)
Net periodic benefit cost	$ 1	$ 6	$ 1	$ 13