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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Net revenue $ 1,284 $ 1,211
Americas    
Net revenue 433  
Europe    
Net revenue 383  
Asia Pacific    
Net revenue 468  
Life Sciences and Applied Markets    
Net revenue 607 596
Life Sciences and Applied Markets | Americas    
Net revenue 168  
Life Sciences and Applied Markets | Europe    
Net revenue 164  
Life Sciences and Applied Markets | Asia Pacific    
Net revenue 275  
Agilent CrossLab    
Net revenue 442 408
Agilent CrossLab | Americas    
Net revenue 156  
Agilent CrossLab | Europe    
Net revenue 128  
Agilent CrossLab | Asia Pacific    
Net revenue 158  
Diagnostics and Genomics    
Net revenue 235 $ 207
Diagnostics and Genomics | Americas    
Net revenue 109  
Diagnostics and Genomics | Europe    
Net revenue 91  
Diagnostics and Genomics | Asia Pacific    
Net revenue 35  
Instrumentation    
Net revenue 567  
Non-Instrumentation and Other    
Net revenue 717  
Pharmaceutical and Biotechnology Market    
Net revenue 391  
Chemical and Energy Market    
Net revenue 308  
Diagnostics and Clinical Market    
Net revenue 187  
Food Market    
Net revenue 129  
Academia and Government Market    
Net revenue 116  
Environmental and Forensics Market    
Net revenue $ 153