Retirement Plans Benefits Plans (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 42	$ 44
Interest cost	113	114
Expected return on plan assets	(169)	(178)
Recognized net actuarial loss (gain)	86	84
Amortization of prior service credit	(17)	(17)
Net periodic benefit cost	55	47
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	8	8
Expected return on plan assets	(8)	(8)
Recognized net actuarial loss (gain)	(1)	(1)
Amortization of prior service credit	(1)	(2)
Net periodic benefit cost	$ 1	$ 0