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SEGMENT INFORMATION Profitability (Details)
$ in Millions
 12 Months Ended
Oct. 31, 2020
USD ($)
segment
numberOfCustomers
Oct. 31, 2019
USD ($)
numberOfCustomers
Oct. 31, 2018
USD ($)
numberOfCustomers
Segment Reporting [Abstract]      
Number of operating segments | segment 3    
Select income statement components      
Net revenue $ 5,339 $ 5,163 $ 4,914
Income from operations 846 941 904
Depreciation expense 119 111 102
Share-based compensation $ 83 $ 72 $ 70
Number of customers representing 10 percent or more of total net revenue | numberOfCustomers 0 0 0
Life Sciences and Applied Markets      
Select income statement components      
Net revenue $ 2,392 $ 2,302 $ 2,270
Income from operations 548 542 543
Depreciation expense 43 41 38
Share-based compensation 35 33 33
Diagnostics and Genomics      
Select income statement components      
Net revenue 1,047 1,021 943
Income from operations 192 185 173
Depreciation expense 39 35 33
Share-based compensation 17 14 14
Agilent CrossLab      
Select income statement components      
Net revenue 1,900 1,840 1,701
Income from operations 516 475 388
Depreciation expense 37 35 31
Share-based compensation 29 25 24
Segment Total      
Select income statement components      
Net revenue 5,339 5,163 4,914
Income from operations 1,256 1,202 1,104
Depreciation expense 119 111 102
Share-based compensation $ 81 $ 72 $ 71