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Pretax Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Qualified defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 217	$ 208	$ 652	$ 694
Interest cost	448	468	1,343	1,444
Expected return on plan assets	(683)	(687)	(2,050)	(2,006)
Recognized net actuarial losses	399	365	1,199	807
Amortization of prior service (credits) costs	(97)	(96)	(292)	(54)
Total net periodic benefit cost	284	258	852	885
Retiree medical and life insurance plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	16	16
Interest cost	28	31	83	92
Expected return on plan assets	(37)	(36)	(111)	(109)
Recognized net actuarial losses	10	5	32	17
Amortization of prior service (credits) costs	1	1	3	3
Total net periodic benefit cost	$ 8	$ 6	$ 23	$ 19

X

- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 1



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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

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-Publisher FASB



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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Glossary Expected Return on Plan Assets



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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Service Cost (Component of Net Periodic Pension Cost)



-URI http://asc.fasb.org/extlink&oid=6525008



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