Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
Jun. 13, 2015	Dec. 27, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Expected reclassification of net gains (losses) related to hedge from accumulated OCI into net income within the next 12 months	$ 9
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	120	$ 111
Debt Instrument, Fair Value Disclosure	$ 33,000	31,000
Call Option For Indirect Equity Percentage	20.00%
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative maturity term, maximum	3 years
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative maturity term, maximum	2 years
Derivative, Notional Amount	$ 2,000	2,700
Interest rate derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 7,800	$ 9,300
Percentage of total debt, net of related interest rate derivatives, exposed to variable interest rates	26.00%	25.00%
Designated as Hedging Instrument [Member] \| Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 1,000	$ 1,200

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

Call Option For Indirect Equity Percentage

+ References

No definition available.

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance-sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

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- Definition

High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

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

No definition available.

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