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Contract Assets and Contract Liabilities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020	Jan. 01, 2021
Revenue from Contract with Customer [Abstract]
U.S. Government's progress payment rate	90.00%		90.00%		80.00%
Recognized sales on contract liabilities	$ 94	$ 97	$ 821	$ 882

X

- Definition

Government Contract Receivable, Progress Payment Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	hrs_
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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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