Contracts in Process (Details) (USD $) In Millions	3 Months Ended			6 Months Ended
	Jul. 01, 2011		Jun. 25, 2010	Jul. 01, 2011		Jun. 25, 2010	Dec. 31, 2010
Components of contracts in process
Unbilled contract receivables, gross	$ 3,019			$ 3,019			$ 2,769
Less: unliquidated progress payments	(1,199)			(1,199)			(1,007)
Unbilled contract receivables, net	1,820			1,820			1,762
Inventoried contract costs, gross	1,034			1,034			882
Less: unliquidated progress payments	(120)			(120)			(96)
Inventoried contract costs, net	914			914			786
Total contracts in process	2,734	[1]		2,734	[1]		2,548
General & Administrative, Independent Research & Development and Bid and Proposal Costs
Amounts included in inventoried contract costs at beginning of the period	102		84	97		77
Add: Contract costs incurred	340		342	652		655
Less: Amounts charged to cost of sales	(330)		(333)	(637)		(639)
Amounts included in inventoried contract costs at end of the period	112		93	112		93
Selling, general and administrative expenses and research and development expenses
Selling, general and administrative expenses	76		69	152		132
Research and development expenses	20		20	38		32
Total	96		89	190		164
Contracts in Process (Textuals)
Independent research and development and bid and proposal costs included in inventoried contract costs	98		92	179		173
General and administrative costs included in inventoried contract costs	$ 242		$ 250	$ 473		$ 482

[1] Unaudited