Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 30	$ 26	$ 95	$ 85
Interest cost	33	34	99	100
Expected return on plan assets	(41)	(37)	(124)	(108)
Amortization of prior service costs (credits)	1	1	1	1
Amortization of net loss	20	17	63	51
Curtailment loss	2	4	2	5
Net periodic benefit cost	45	45	136	134
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	1		3	3
Interest cost	2	2	5	7
Expected return on plan assets			(2)	(2)
Amortization of prior service costs (credits)	(1)	(1)	(2)	(2)
Amortization of net loss			1	1
Curtailment loss
Net periodic benefit cost	$ 2	$ 1	$ 5	$ 7