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Segment Information
 3 Months Ended
Mar. 31, 2024
Segment Reporting [Abstract]  
Segment Information
9. SEGMENT INFORMATION
We have two reportable segments, Core Illumina and GRAIL. We report segment information based on the management approach, which designates the internal reporting used by the Chief Operating Decision Maker (CODM) for making decisions and assessing performance as the source of our reportable segments. The CODM allocates resources and assesses the performance of each operating segment using information about its revenue and income (loss) from operations. Our CODM does not evaluate our operating segments using discrete asset information. We do not allocate expenses between segments. Core Illumina sells products and provides services to GRAIL, and vice versa, in accordance with contractual agreements between the entities.
Core Illumina: Core Illumina’s products and services serve customers in the research, clinical and applied markets, and enable the adoption of a variety of genomic solutions. Core Illumina includes all of our operations, excluding the results of GRAIL.
GRAIL: GRAIL is a healthcare company focused on early detection of multiple cancers.
In millionsQ1 2024Q1 2023
Revenue:
Core Illumina$1,056 $1,076 
GRAIL27 20 
Eliminations(7)(9)
Consolidated revenue$1,076 $1,087 
Income (loss) from operations:
Core Illumina$116 $142 
GRAIL(227)(204)
Eliminations— (2)
Consolidated loss from operations$(111)$(64)
Total other income (expense), net primarily relates to Core Illumina, and we do not allocate income taxes to our segments.