Pretax Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Qualified defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 243	$ 285	$ 486	$ 571
Interest cost	488	450	976	900
Expected return on plan assets	(659)	(621)	(1,319)	(1,243)
Recognized net actuarial losses	221	353	442	706
Amortization of prior service costs (credits)	21	20	42	40
Total net periodic benefit cost	314	487	627	974
Retiree medical and life insurance plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	11	14
Interest cost	30	29	61	58
Expected return on plan assets	(37)	(37)	(73)	(73)
Recognized net actuarial losses	6	11	12	22
Amortization of prior service costs (credits)	1	(4)	2	(9)
Total net periodic benefit cost	$ 6	$ 6	$ 13	$ 12