Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266

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

Goodwill and Intangible Assets (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
Goodwill and Intangible Assets (Narrative) (Details)	Oct. 02, 2020 USD ($)	Sep. 27, 2019 USD ($)	Oct. 02, 2020 USD ($) segment	Sep. 27, 2019 USD ($)	Jan. 03, 2020 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Goodwill re-allocation			$ 0		$ 0
Number of reportable segments, goodwill reallocation \| segment			2
Goodwill impairments			$ 0	$ 0
Amortization of intangible assets	$ 60,000,000	$ 43,000,000	154,000,000	$ 129,000,000
Defense Solutions
Indefinite-lived Intangible Assets [Line Items]
Goodwill re-allocation			$ 429,000,000		$ 25,000,000