Pension and Other Employee Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 27	$ 32
Interest cost	36	33
Expected return on plan assets	(48)	(42)
Amortization of prior service costs (credits)	1
Amortization of net loss (gain)	4	22
Curtailment loss	1
Net periodic benefit cost	21	45
Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	1	1
Interest cost	2	2
Expected return on plan assets	(1)	(1)
Amortization of prior service costs (credits)	(1)	1
Amortization of net loss (gain)		(1)
Curtailment loss
Net periodic benefit cost	$ 1	$ 2