Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 33	$ 29	$ 65	$ 59
Interest cost	33	33	66	66
Expected return on plan assets	(41)	(36)	(83)	(71)
Amortization of prior service (credits) cost
Amortization of net losses	21	17	43	34
Curtailment loss				1
Net periodic benefit cost	46	43	91	89
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	1	2	2	3
Interest cost	1	2	3	5
Expected return on plan assets	(1)	(1)	(2)	(2)
Amortization of prior service (credits) cost		(1)	1	(1)
Amortization of net losses		1	(1)	1
Curtailment loss
Net periodic benefit cost	$ 1	$ 3	$ 3	$ 6