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Balance Sheet Account Details - Narrative - Investment in Consolidated Variable Interest Entities (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 9 Months Ended
Feb. 28, 2017
Jul. 03, 2016
Jan. 31, 2016
Oct. 01, 2017
Oct. 02, 2016
Feb. 27, 2017
Jan. 01, 2017
Jan. 03, 2016
Jul. 31, 2015
Variable Interest Entity [Line Items]                  
Contributions from noncontrolling interest owners       $ 79 $ 80        
Noncontrolling shareholders interest percentage       50.00%          
Cash and cash equivalents attributable to variable interest entities       $ 1,354 $ 795   $ 735 $ 769  
Variable Interest Entity, Primary Beneficiary [Member]                  
Variable Interest Entity [Line Items]                  
Cash and cash equivalents attributable to variable interest entities       $ 32          
GRAIL, Inc. [Member]                  
Variable Interest Entity [Line Items]                  
Deemed dividend   $ 10              
Deemed dividend, tax effect   $ 10              
GRAIL, Inc. [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Variable Interest Entity [Line Items]                  
Series A financing     $ 120            
Amount contributed     40            
Contributions from noncontrolling interest owners     $ 80            
Equity ownership interest percentage           52.00%      
Helix Holdings I, LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Variable Interest Entity [Line Items]                  
Equity ownership interest percentage       50.00%         50.00%
GRAIL Class B [Member] | GRAIL, Inc. [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Variable Interest Entity [Line Items]                  
Series A financing $ 900                
Stock exchanged (in shares)     113            
GRAIL Class A-1 Convertible [Member] | GRAIL, Inc. [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Variable Interest Entity [Line Items]                  
Shares authorized by GRAIL issued to Illumina   98              
Illumina Class B [Member] | GRAIL, Inc. [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Variable Interest Entity [Line Items]                  
Shares authorized by Illumina issued to GRAIL   98