Contracts in Process (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2012		Apr. 01, 2011	Dec. 31, 2011
Components of contracts in process
Unbilled contract receivables, gross	$ 3,107			$ 2,926
Unliquidated progress payments	(1,160)			(1,146)
Unbilled contract receivables, net	1,947			1,780
Inventoried contract costs, gross	950			928
Unliquidated progress payments	(71)			(79)
Inventoried contract costs, net	879			849
Total contracts in process	2,826	[1]		2,629
General & Administrative, Independent Research & Development and Bid and Proposal Costs
Amounts included in inventoried contract costs at beginning of the period	91		97
Add: IRAD and B&P costs	87		81
Other G&A costs	235		231
Total contract costs incurred	322		312
Less: Amounts charged to cost of sales	(313)		(307)
Amounts included in inventoried contract costs at end of the period	100		102
Selling, general and administrative expenses and research and development expenses
Selling, general and administrative expenses	76		76
Research and development expenses	19		18
Total	$ 95		$ 94

[1] Unaudited