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v3.20.1

Subsequent Events (Details) | 1 Months Ended
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May 06, 2020
Subsequent Event | Engineered Products and Forgings |
Subsequent Event [Line Items] |
Percentage of revenue from aerospace end market (percent) | 71.00%

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- Definition Percentage Of Revenue From Aersopace End Market + References No definition available. + Details
Name: | arnc_PercentageOfRevenueFromAersopaceEndMarket
Namespace Prefix: | arnc_
Data Type: | num:percentItemType
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: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=arnc_EngineeredProductsAndForgingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |