Segment Information

9 Months Ended

Sep. 29, 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	September 29, 2019		September 30, 2018		September 29, 2019		September 30, 2018
Aerospace	$	2,495	$	2,031	$	393	$	376
Combat Systems	1,740		1,523		264		241
Information Technology	2,071		2,307		146		157
Mission Systems	1,220		1,230		185		179
Marine Systems	2,235		2,003		209		169
Corporate	—		—		19		13
Total	$	9,761	$	9,094	$	1,216	$	1,135
Nine Months Ended
Aerospace	$	6,871	$	5,751	$	1,052	$	1,108
Combat Systems	5,035		4,497		712		701
Information Technology	6,398		5,887		456		414
Mission Systems	3,655		3,475		495		478
Marine Systems	6,618		6,205		586		548
Corporate	—		—		19		(18		)
Total	$	28,577	$	25,815	$	3,320	$	3,231

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.