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Revenue - Revenue by Products and Services (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Revenue [Line Items]
Revenue		$ 9,555	$ 9,186	$ 18,816	$ 16,721
Aerospace
Revenue [Line Items]
Revenue		2,136	1,895	4,376	3,720
Aerospace | Aircraft manufacturing and completions
Revenue [Line Items]
Revenue		1,597	1,362	3,288	2,728
Aerospace | Aircraft services
Revenue [Line Items]
Revenue		537	531	1,044	982
Aerospace | Pre-owned aircraft
Revenue [Line Items]
Revenue		2	2	44	10
Combat Systems
Revenue [Line Items]
Revenue		1,659	1,534	3,295	2,974
Combat Systems | Military vehicles
Revenue [Line Items]
Revenue		1,090	990	2,224	1,946
Combat Systems | Weapons systems, armament and munitions
Revenue [Line Items]
Revenue		461	443	862	826
Combat Systems | Engineering and other services
Revenue [Line Items]
Revenue		108	101	209	202
Information Technology
Revenue [Line Items]
Revenue		2,158	2,442	4,327	3,580
Information Technology | Information technology services
Revenue [Line Items]
Revenue		2,158	2,442	4,327	3,580
Mission Systems
Revenue [Line Items]
Revenue		1,277	1,147	2,435	2,245
Mission Systems | C4ISR solutions
Revenue [Line Items]
Revenue	[1]	1,277	1,147	2,435	2,245
Marine Systems
Revenue [Line Items]
Revenue		2,325	2,168	4,383	4,202
Marine Systems | Nuclear-powered submarines
Revenue [Line Items]
Revenue		1,538	1,438	2,915	2,734
Marine Systems | Surface ships
Revenue [Line Items]
Revenue		528	473	974	956
Marine Systems | Repair and other services
Revenue [Line Items]
Revenue		$ 259	$ 257	$ 494	$ 512
[1]

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No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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