Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Sales and service revenues by segment

The following table presents sales and operating income by segment:

	Year Ended December 31
$ in millions	2012			2011			2010
Sales
Aerospace Systems		$ 9,977			$ 9,964			$10,436
Electronic Systems	6,950			7,372			7,613
Information Systems	7,356			7,921			8,395
Technical Services	3,019			3,193			3,705
Intersegment eliminations	(2,084		)	(2,038		)	(2,006		)
Total sales	25,218			26,412			28,143
Operating income
Aerospace Systems	1,218			1,217			1,213
Electronic Systems	1,187			1,070			1,023
Information Systems	761			766			756
Technical Services	268			260			249
Intersegment eliminations	(258		)	(258		)	(231		)
Total segment operating income	3,176			3,055			3,010
Reconciliation to operating income:
Unallocated corporate expenses	(168		)	(166		)	(182		)
Net FAS/CAS pension adjustment	132			400			10
Other	(10		)	(13		)	(11		)
Total operating income		$ 3,130			$ 3,276			$ 2,827

Intersegment sales and operating income

Intersegment sales and operating income before eliminations were as follows:

	Year Ended December 31
$ in millions	2012					2011					2010
	Sales		Operating Income			Sales		Operating Income			Sales		Operating Income
Intersegment sales and operating income
Aerospace Systems		$ 171			$ 20		$ 134			$ 18		$ 133		$	13
Electronic Systems	607			110		649			131		684			118
Information Systems	682			78		687			68		623			61
Technical Services	624			50		568			41		566			39
Total		$2,084			$258		$2,038			$258		$2,006			$231

Total assets by segment

	December 31
$ in millions	2012		2011
Assets
Aerospace Systems		$ 6,657		$ 6,525
Electronic Systems	4,551		4,705
Information Systems	6,940		7,144
Technical Services	1,313		1,352
Segment assets	19,461		19,726
Corporate	7,082		5,685
Total assets		$26,543		$25,411

Additional information by segment

	Capital Expenditures						Depreciation and Amortization
$ in millions	2012		2011		2010		2012		2011		2010
Aerospace Systems		$154		$184		$195		$196		$200		$237
Electronic Systems	84		121		176		139		144		150
Information Systems	40		45		37		100		121		133
Technical Services	3		1		5		4		4		5
Corporate	50		141		172		71		75		30
Total from continuing operations		$331		$492		$585		$510		$544		$555