Segment Information

6 Months Ended

Jun. 30, 2019

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
Three Months Ended	June 30, 2019		July 1, 2018		June 30, 2019		July 1, 2018
Aerospace	$	2,136	$	1,895	$	331	$	386
Combat Systems	1,659		1,534		242		236
Information Technology	2,158		2,442		154		156
Mission Systems	1,277		1,147		162		153
Marine Systems	2,325		2,168		197		195
Corporate	—		—		4		(38		)
Total	$	9,555	$	9,186	$	1,090	$	1,088
Six Months Ended
Aerospace	$	4,376	$	3,720	$	659	$	732
Combat Systems	3,295		2,974		448		460
Information Technology	4,327		3,580		310		257
Mission Systems	2,435		2,245		310		299
Marine Systems	4,383		4,202		377		379
Corporate	—		—		—		(31		)
Total	$	18,816	$	16,721	$	2,104	$	2,096

Corporate operating results have two primary components: pension and other post-retirement benefit income, and stock option expense. We are required to report the non-service cost components of pension and other post-retirement benefit cost (e.g., interest cost) in other income (expense) in the Consolidated Statement of Earnings. As described in Note O, in our defense segments, pension and other post-retirement

benefit costs are recoverable contract costs. Therefore, the non-service cost components are included in the operating results of these segments, but an offset is reported in Corporate.