XML 87 R76.htm IDEA: XBRL DOCUMENT
v3.19.2

Subsequent Events Narrative (Details) - location |  |  | 1 Months Ended
--- | --- | --- | ---
Jul. 25, 2019 | Apr. 13, 2018 | Jun. 30, 2019
Subsequent Event [Line Items] |  |  |
Labor agreement term |  | 5 years | 3 years
Labor agreement, number of locations covered |  |  | 4
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Labor agreement term | 4 years |  |

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- Definition Labor Agreement, Number Of Locations Covered + References No definition available. + Details
Name: | arnc_LaborAgreementNumberOfLocationsCovered
Namespace Prefix: | arnc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Labor Agreement Term + References No definition available. + Details
Name: | arnc_LaborAgreementTerm
Namespace Prefix: | arnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |