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LEASES - Textual (Details) - USD ($) $ in Millions	Oct. 31, 2020	Oct. 31, 2019
Leases [Abstract]
operating leased assets - original cost	$ 43	$ 49
Operating leased assets net book value	12	17
Sales-type Lease, Lease Receivable	$ 44	$ 37

X

- Definition

Original costs for operating leased assets.

+ References

No definition available.

+ Details

Name:	a_OperatingLeasedAssetsOriginalCost
Namespace Prefix:	a_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Operating leased assets net book value.

+ References

No definition available.

+ Details

Name:	a_Operatingleasedassetsnetbookvalue
Namespace Prefix:	a_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919379-209981

+ Details

Name:	us-gaap_SalesTypeLeaseLeaseReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant