Unbilled Receivables - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 04, 2021	Jul. 04, 2021	Dec. 31, 2020
Contracts In Process [Line Items]
Net unbilled receivables		$ 7,923	$ 8,024
Large International Wheel Armored Vehicle \| Combat Systems
Contracts In Process [Line Items]
Net unbilled receivables		1,800	$ 2,800
Progress payments received	$ 1,000	$ 1,500

Cash received from customers as progress payments on projects that have been partially completed.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123371682&loc=d3e55415-109406

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585

Name:	us-gaap_ProceedsFromCustomersForProgressPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration