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Segment Information (Tables)
9 Months Ended
Sep. 27, 2020
Segment Reporting [Abstract]  
Summary of Operating Performance and Assets by Segment Core Illumina sells products and provides services to Helix in accordance with contractual agreements between the entities.
In millionsQ3 2020Q3 2019YTD 2020YTD 2019
Revenue:
Core Illumina$794 $907 $2,286 $2,591 
Helix —  
Elimination of intersegment revenue —  (1)
Consolidated revenue$794 $907 $2,286 $2,591 
Income (loss) from operations:
Core Illumina$162 $308 $447 $740 
Helix —  (24)
Elimination of intersegment earnings —  
Consolidated income from operations$162 $308 $447 $717