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Organization and Significant Accounting Policies - Narrative - Revenue Recognition (Details)	12 Months Ended
	Jan. 02, 2022
Product revenue
Revenue from External Customer [Line Items]
Payment period from invoice	60 days

X

- Definition

Revenue From Contract With Customer, Payment Term

+ References

No definition available.

+ Details

Name:	ilmn_RevenueFromContractWithCustomerPaymentTerm
Namespace Prefix:	ilmn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_ProductMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: