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RETIREMENT PLANS AND POST RETIREMENT PENSION PLANS Defined Contribution (Details) - USD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Defined Contribution Plan Disclosure [Line Items] |  |  |
Maximum employer matching contribution in the 401(k) plan (in hundredths) | 6.00% |  |
Maximum employee contribution to 401(k) | 50.00% |  |
401(k) Plan employer expense | $ 39 | $ 37 | $ 33
401(k) Additional company contribution |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Transitional company contribution to employee 401(k) | 4.00% |  |
401(k) Additional company contribution | 3 Percent |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Transitional company contribution to employee 401(k) | 3.00% |  |
401(k) Additional company contribution | 5 Percent |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Transitional company contribution to employee 401(k) | 5.00% |  |

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- Definition Additional transitional company contribution to employee 401(k) plans for certain employees. + References No definition available. + Details
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Namespace Prefix: | a_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
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Data Type: | na
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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
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Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
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Period Type: |