SEGMENT INFORMATION

We have five operating segments, Aerospace, Combat Systems, Information Technology, Mission Systems and Marine Systems. We organize our segments in accordance with the nature of products and services offered. We measure each segment’s profitability based on operating earnings. As a result, we do not allocate net interest, other income and expense items, and income taxes to our segments.

Summary financial information for each of our segments follows:



	Revenue				Operating Earnings					Revenue from U.S. Government
Three Months Ended	July 1, 2018		July 2, 2017		July 1, 2018			July 2, 2017		July 1, 2018		July 2, 2017
Aerospace	$	1,895	$	2,078	$	386		$	421	$	108	$	41
Combat Systems	1,534		1,414		236			225		746		744
Information Technology	2,442		1,052		156			87		2,370		981
Mission Systems	1,147		1,052		153			153		908		840
Marine Systems	2,168		2,079		195			178		2,072		2,056
Corporate	—		—		(38		)	3		—		—
Total	$	9,186	$	7,675	$	1,088		$	1,067	$	6,204	$	4,662
Six Months Ended
Aerospace	$	3,720	$	4,152	$	732		$	860	$	165	$	90
Combat Systems	2,974		2,701		460			430		1,423		1,463
Information Technology	3,580		2,110		257			177		3,448		1,974
Mission Systems	2,245		2,140		299			299		1,775		1,699
Marine Systems	4,202		4,013		379			339		4,051		3,951
Corporate	—		—		(31		)	8		—		—
Total	$	16,721	$	15,116	$	2,096		$	2,113	$	10,862	$	9,177

Corporate operating results have two primary components: pension and other post-retirement benefit income, and stock option expense. ASU 2017-07 requires the non-service cost components of pension and other post-retirement benefit cost (e.g., interest cost) to be reported in other income (expense) in the Consolidated Statement of Earnings. In our defense segments, pension and other post-retirement benefit costs are allocable contract costs. For these segments, we report the offset for the non-service cost components in Corporate operating results. The second quarter and first six months of 2018 also included one-time charges of approximately $45 associated with the costs to complete the CSRA acquisition.

The following is additional summary financial information for each of our segments:



	Capital Expenditures				Depreciation and Amortization
Six Months Ended	July 1, 2018		July 2, 2017		July 1, 2018		July 2, 2017
Aerospace	$	102	$	50	$	72	$	77
Combat Systems	26		31		42		42
Information Technology	21		4		120		15
Mission Systems	26		25		33		29
Marine Systems	81		37		55		51
Corporate	23		6		5		6
Total	$	279	$	153	$	327	$	220

Identifiable assets for each of our segments follows:



	July 1, 2018		December 31, 2017
Aerospace	$	10,990	$	10,126
Combat Systems	10,110		9,846
Information Technology	14,918		3,021
Mission Systems	6,079		5,856
Marine Systems	2,917		2,906
Corporate*	2,138		3,291
Total	$	47,152	$	35,046

* Corporate identifiable assets are primarily cash and equivalents.