Pension and Postretirement Benefit Plans - Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended			12 Months Ended
		Jan. 31, 2015	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015		Jun. 29, 2014	Dec. 31, 2014
U.S. Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	[1]		$ 72	$ 63	$ 144		$ 127
Interest cost	[1]		168	175	337		350
Expected return on plan assets	[1]		(270)	(262)	(542)		(525)
Actuarial losses	[1]		82	15	165		31
Prior service credits	[1]		(2)	(1)	(3)		(3)
Curtailments	[1]		0	0	1		2
Settlements	[1]		19	12	45		21
Special termination benefits	[1]		0	0	0		0
Defined benefit plan, net periodic benefit cost	[1]		69	2	147		3
Voluntary contribution		$ 1,000			$ 1,000	[2]
Expected return on plan assets, percentage					8.25%			8.50%
U.S. Supplemental (Non-Qualified) [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost			6	5	$ 11		10
Interest cost			13	14	27		29
Expected return on plan assets			0	0	0		0
Actuarial losses			11	8	23		15
Prior service credits			0	(1)	(1)		(1)
Curtailments			0	0	0		0
Settlements			2	5	17		16
Special termination benefits			0	0	0		0
Defined benefit plan, net periodic benefit cost			32	31	77		69
Voluntary contribution	[2]				84
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	[3]		46	52	94		104
Interest cost	[3]		76	101	155		201
Expected return on plan assets	[3]		(103)	(116)	(209)		(230)
Actuarial losses	[3]		31	24	63		49
Prior service credits	[3]		(2)	(1)	(3)		(3)
Curtailments	[3]		0	16	0		15
Settlements	[3]		1	1	1		2
Special termination benefits	[3]		0	3	0		5
Defined benefit plan, net periodic benefit cost	[3]		50	80	101		143
Voluntary contribution	[2]				117
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	[4]		14	14	27		28
Interest cost	[4]		32	42	64		84
Expected return on plan assets	[4]		(13)	(15)	(26)		(31)
Actuarial losses	[4]		9	2	18		3
Prior service credits	[4]		(31)	(15)	(62)		(29)
Curtailments	[4]		(7)	(1)	(17)		(4)
Settlements	[4]		0	0	0		0
Special termination benefits	[4]		0	0	0		0
Defined benefit plan, net periodic benefit cost	[4]		$ 5	$ 27	6		$ 51
Voluntary contribution	[2]				$ (30)

[1] The increase in net periodic benefit costs for the three and six months ended June 28, 2015, compared to the three and six months ended June 29, 2014, for our U.S. qualified pension plans was primarily driven by (i) the increase in the amounts amortized for actuarial losses resulting from the decrease, in 2014, in the discount rate used to determine the benefit obligation (which increased the amount of deferred actuarial losses) and, to a lesser extent, a 2014 change in mortality assumptions (reflecting a longer life expectancy for plan participants), and (ii) higher settlement activity. The aforementioned increases were partially offset by (i) a greater expected return on plan assets resulting from an increased plan asset base due to a voluntary contribution of $1.0 billion made at the beginning of January 2015, which in turn was partially offset by a decrease in the expected rate of return on plan assets from 8.50% to 8.25%, and (ii) lower interest costs resulting from the decrease, in 2014, in the discount rate used to determine the benefit obligation.

[2] Contributions to the postretirement plans were more than offset by reimbursements of approximately $133 million received for eligible 2014 prescription drug expenses for certain retirees.

[3] The decrease in net periodic benefit costs for the three and six months ended June 28, 2015, compared to the three and six months ended June 29, 2014, for our international pension plans was primarily driven by (i) the decrease in interest cost resulting from the decrease, in 2014, in the discount rate used to determine the benefit obligation, (ii) a decrease in service cost related to changes in actuarial assumptions (lower inflation and lower rate of wage increases) and the U.K. pension plan freeze in 2014, which offset the impact of the decrease, in 2014, in the discount rate used to determine the benefit obligation (the effect of which is an increase in service costs). The aforementioned decreases to net periodic benefit costs were partially offset by (i) a decrease in the expected return on plan assets due to a lower expected rate of return on plan assets and (ii) an increase in the amounts amortized for actuarial losses resulting from the decrease, in 2014, in the discount rate used to determine the benefit obligation.

[4] The decrease in net periodic benefit costs for the three and six months ended June 28, 2015, compared to the three and six months ended June 29, 2014, for our postretirement plans was primarily driven by (i) the increase in the amounts amortized for prior service credits and (ii) an increase in curtailment gain resulting from the implementation of changes to certain retiree medical benefits to adopt programs eligible for the Medicare Part D plan subsidy, as allowed under the employer group waiver plan, which was approved and communicated to plan participants, and will go into effect on January 1, 2016, as well as (iii) a decrease in interest cost resulting from the decrease, in 2014, in the discount rate used to determine the benefit obligation. The aforementioned decreases were partially offset by an increase in actuarial losses resulting from the decrease, in 2014, in the discount rate used to determine the benefit obligation.