SEGMENT INFORMATION - Profitability (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018 USD ($)	Jul. 31, 2017 USD ($)	Jul. 31, 2018 USD ($)	Jul. 31, 2017 USD ($)
Segment Reporting Information
Number of operating segments	3
Segment Reporting Information
Net revenue	$ 1,203	$ 1,114	$ 3,620	$ 3,283
Income from operations	225	201	679	608
Life Sciences and Applied Markets
Segment Reporting Information
Net revenue	540	510	1,673	1,531
Income from operations	123	109	392	337
Diagnostics and Genomics
Segment Reporting Information
Net revenue	237	218	687	625
Income from operations	44	37	119	117
Agilent CrossLab
Segment Reporting Information
Net revenue	426	386	1,260	1,127
Income from operations	102	90	288	246
Segment Total
Segment Reporting Information
Net revenue	1,203	1,114	3,620	3,283
Income from operations	$ 269	$ 236	$ 799	$ 700