Inventoried Costs, Net (Tables)

12 Months Ended

Dec. 31, 2010

Inventoried Costs Net (Table) [Abstract]

Inventoried costs

	December 31
$ in millions	2010			2009
Production costs of contracts in process	$	1,521		$	1,648
General and administrative expenses		190			160
		1,711			1,808
Progress payments received		(962	)		(1,098	)
		749			710
Product inventory		147			164
Total inventoried costs, net	$	896		$	874