Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

The following table presents sales and operating income by segment:



	Year Ended December 31
$ in millions	2017			2016			2015
Sales
Aerospace Systems	$	11,955		$	10,828		$	9,940
Mission Systems	11,382			10,928			10,674
Technology Services	4,750			4,825			4,819
Intersegment eliminations	(2,284		)	(2,073		)	(1,907		)
Total sales	25,803			24,508			23,526
Operating income
Aerospace Systems	1,259			1,236			1,205
Mission Systems	1,453			1,445			1,410
Technology Services	524			512			514
Intersegment eliminations	(277		)	(258		)	(209		)
Total segment operating income	2,959			2,935			2,920
Net FAS/CAS pension adjustment	594			316			348
Unallocated corporate expenses	(250		)	(53		)	(190		)
Other	(4		)	(5		)	(2		)
Total operating income	$	3,299		$	3,193		$	3,076

The following table presents intersegment sales and operating income before eliminations:



	Year Ended December 31
$ in millions	2017					2016					2015
	Sales		Operating Income			Sales		Operating Income			Sales		Operating Income
Intersegment sales and operating income
Aerospace Systems	$	295		$	33	$	239		$	28	$	221		$	27
Mission Systems	954			141		875			136		781			97
Technology Services	1,035			103		959			94		905			85
Total	$	2,284		$	277	$	2,073		$	258	$	1,907		$	209

The following table presents assets by segment:


⁽¹⁾	Corporate assets principally consist of cash and cash equivalents and deferred tax assets.

The following table presents capital expenditures and depreciation and amortization by segment:



	Capital Expenditures						Depreciation and Amortization⁽¹⁾
$ in millions	2017		2016		2015		2017		2016		2015
Aerospace Systems	$	665	$	451	$	237	$	234	$	216	$	215
Mission Systems	164		372		141		131		140		153
Technology Services	15		6		3		40		37		36
Corporate	84		91		90		70		63		63
Total	$	928	$	920	$	471	$	475	$	456	$	467


⁽¹⁾	Depreciation and amortization expense includes amortization of purchased intangible assets, as well as amortization of deferred and other outsourcing costs.