Segment Information (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Schedule of Financial Information For Each Of Our Business Groups

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

	Identifiable Assets						Capital Expenditures						Depreciation and Amortization
Year Ended December 31	2019		2018		2017		2019		2018		2017		2019		2018		2017
Aerospace	$	12,324	$	11,220	$	10,126	$	138	$	194	$	132	$	178	$	154	$	147
Combat Systems	11,220		9,853		9,846		109		91		84		85		87		86
Information     Technology	14,248		14,159		3,021		147		62		16		377		333		32
Mission Systems	6,205		5,984		5,856		75		49		47		60		65		60
Marine Systems	3,918		3,130		2,906		449		243		123		122		116		109
Corporate*	926		1,062		3,291		69		51		26		7		8		7
Total	$	48,841	$	45,408	$	35,046	$	987	$	690	$	428	$	829	$	763	$	441

* Corporate identifiable assets are primarily cash and equivalents.

Summary financial information for each of our segments follows:

	Revenue						Operating Earnings							Revenue from U.S. Government
Year Ended December 31	2019		2018		2017		2019		2018			2017		2019		2018		2017
Aerospace	$	9,801	$	8,455	$	8,129	$	1,532	$	1,490		$	1,577	$	498	$	334	$	231
Combat Systems	7,007		6,241		5,949		996		962			937		4,048		3,228		3,084
Information     Technology	8,422		8,269		4,410		628		608			373		8,240		8,025		4,164
Mission Systems	4,937		4,726		4,481		683		659			638		3,994		3,774		3,629
Marine Systems	9,183		8,502		8,004		785		761			685		9,027		8,245		7,913
Corporate	—		—		—		24		(23		)	26		—		—		—
Total	$	39,350	$	36,193	$	30,973	$	4,648	$	4,457		$	4,236	$	25,807	$	23,606	$	19,021

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area

The following table presents our revenue by geographic area based on the location of our customers:

Year Ended December 31	2019		2018		2017
North America:
United States	$	31,982	$	28,578	$	23,519
Other	852		755		915
Total North America	32,834		29,333		24,434
Europe	2,808		2,772		2,558
Asia/Pacific	1,670		2,252		2,011
Africa/Middle East	1,739		1,565		1,655
South America	299		271		315
Total revenue	$	39,350	$	36,193	$	30,973