Contracts in Process - Components of Contracts in Progress (Detail) (USD $) In Millions, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Components of contracts in process
Unbilled contract receivables, gross	$ 2,863	$ 2,874
Unliquidated progress payments	(1,162)	(1,265)
Unbilled contract receivables, net	1,701	1,609
Inventoried contract costs, gross	1,110	1,111
Unliquidated progress payments	(63)	(68)
Inventoried contract costs, net	1,047	1,043
Total contracts in process	$ 2,748	$ 2,652

Total amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable.

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

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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+ Details

- Definition

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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