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Segment Information (Tables)
 9 Months Ended
Oct. 03, 2021
Segment Reporting [Abstract]  
Schedule of Operating Performance and Assets by Segment
The following table presents the operating performance of each reportable segment:

In millionsQ3 2021Q3 2020YTD 2021YTD 2020
Revenue:
Core Illumina$1,106 $794 $3,325 $2,286 
GRAIL2 — 2 — 
Consolidated revenue$1,108 $794 $3,327 $2,286 
Depreciation and amortization:
Core Illumina$51 $46 $148 $137 
GRAIL14 — 14 — 
Consolidated depreciation and amortization$65 $46 $162 $137 
Income (loss) from operations:
Core Illumina$205 $162 $586 $447 
GRAIL(750)— (750)— 
Consolidated (loss) income from operations$(545)$162 $(164)$447 

Other income, net relates to Core Illumina and we do not allocate income taxes to our segments.

The following table presents the total assets of each reportable segment:

In millionsOctober 3,
2021		January 3,
2021
Core Illumina$5,794 $7,585 
GRAIL9,270 — 
Elimination of intersegment assets(1)— 
Consolidated total assets$15,063 $7,585 
Schedule of Net Long-lived Assets Consisting of Property and Equipment by Region
The following table presents net long-lived assets, consisting of property and equipment and operating lease right-of-use assets, by region:

In millionsOctober 3,
2021		January 3,
2021
United States$1,300 $1,134 
Singapore204 150 
United Kingdom138 141 
Other countries43 29 
Total net long-lived assets$1,685 $1,454