Pension and Postretirement Benefit Plans - Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended				12 Months Ended
	Jan. 31, 2015	Mar. 29, 2015		Mar. 30, 2014		Dec. 31, 2014
U.S. Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 72	[1]	$ 64	[1]
Interest cost		169	[1]	175	[1]
Expected return on plan assets		(272)	[1]	(263)	[1]
Actuarial losses		83	[1]	16	[1]
Prior service credits		(2)	[1]	(2)	[1]
Curtailments		2	[1]	2	[1]
Settlements		26	[1]	9	[1]
Special termination benefits		0	[1]	0	[1]
Defined benefit plan, net periodic benefit cost		78	[1]	1	[1]
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	[3]	5	[3]
Interest cost		14	[3]	15	[3]
Expected return on plan assets		0	[3]	0	[3]
Actuarial losses		12	[3]	7	[3]
Prior service credits		0	[3]	0	[3]
Curtailments		0	[3]	0	[3]
Settlements		15	[3]	11	[3]
Special termination benefits		0	[3]	0	[3]
Defined benefit plan, net periodic benefit cost		45	[3]	38	[3]
Voluntary contribution		72	[2]
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		48	[4]	52
Interest cost		79	[4]	100
Expected return on plan assets		(106)	[4]	(114)
Actuarial losses		32	[4]	25	[4]
Prior service credits		(2)	[4]	(2)	[4]
Curtailments		0	[4]	(1)	[4]
Settlements		0	[4]	1	[4]
Special termination benefits		0	[4]	2	[4]
Defined benefit plan, net periodic benefit cost		51	[4]	63	[4]
Voluntary contribution		58	[2]
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		14	[5]	14	[5]
Interest cost		32	[5]	42	[5]
Expected return on plan assets		(13)	[5]	(16)	[5]
Actuarial losses		9	[5]	1	[5]
Prior service credits		(31)	[5]	(14)	[5]
Curtailments		(10)	[5]	(3)	[5]
Settlements		0	[5]	0	[5]
Special termination benefits		0	[5]	0	[5]
Defined benefit plan, net periodic benefit cost		1	[5]	24	[5]
Voluntary contribution		$ (81)	[2]

[1] The increase in net periodic benefit costs for the three months ended March 29, 2015, compared to the three months ended March 30, 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 8.5% 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 offset by reimbursements of approximately $133 million received for eligible 2014 prescription expenses for certain retirees.

[3] The increase in net periodic benefit costs for the three months ended March 29, 2015, compared to the three months ended March 30, 2014, for our U.S. supplemental (non-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 and, to a lesser extent, a 2014 change in mortality assumptions (reflecting a longer life expectancy for plan participants), and (ii) higher settlement activity.

[4] The decrease in net periodic benefit costs for the three months ended March 29, 2015, compared to the three months ended March 30, 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.

[5] The decrease in net periodic benefit costs for the three months ended March 29, 2015, compared to the three months ended March 30, 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 related to the employer group waiver plan, which went into effect on January 1, 2015, 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.