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Segment Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2018
USD ($)
Jul. 02, 2017
USD ($)
Jul. 01, 2018
USD ($)
segment
Jul. 02, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | segment     2    
Consolidated revenue $ 830 $ 662 $ 1,612 $ 1,261  
Consolidated income from operations 227 143 445 195  
Consolidated total assets 5,851   5,851   $ 5,257
Operating Segments | Core Illumina          
Segment Reporting Information [Line Items]          
Consolidated revenue 829 664 1,612 1,262  
Consolidated income from operations 246 160 484 244  
Consolidated total assets 5,760   5,760   5,223
Operating Segments | Consolidated VIEs          
Segment Reporting Information [Line Items]          
Consolidated revenue 3 2 6 3  
Consolidated income from operations (20) (16) (41) (50)  
Consolidated total assets 199   199   45
Elimination of intersegment          
Segment Reporting Information [Line Items]          
Consolidated revenue (2) (4) (6) (4)  
Consolidated income from operations 1 $ (1) 2 $ 1  
Consolidated total assets $ (108)   $ (108)   $ (11)