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Receivables (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Certain Customers |  |
Schedule Of Financial Receivables [Line Items] |  |
Accounts receivable, sale | $ 712 | $ 593
Accounts receivable sale, amount outstanding | 190 | 158
Receivables Purchase Agreement |  |
Schedule Of Financial Receivables [Line Items] |  |
Accounts receivable securitization following a provision to increase the limit | 325 |
Accounts receivable securitization | 250 |
Accounts receivable securitization amount drawn | 250 | 250
Financing receivables, held as collateral | 201 | 197
Accounts receivable, sale | $ 1,625 | $ 1,547

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- Definition Accounts Receivable From Securitization, Amount Drawn + References No definition available. + Details
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Namespace Prefix: | hwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Accounts Receivable from Securitization, Face Amount + References No definition available. + Details
Name: | hwm_AccountsReceivableFromSecuritizationFaceAmount
Namespace Prefix: | hwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Accounts Receivable From Securitization, Face Amount After Provision To Increase Limit + References No definition available. + Details
Name: | hwm_AccountsReceivableFromSecuritizationFaceAmountAfterProvisionToIncreaseLimit
Namespace Prefix: | hwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Accounts Receivable, Sale, Amount Outstanding + References No definition available. + Details
Name: | hwm_AccountsReceivableSaleAmountOutstanding
Namespace Prefix: | hwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing Receivables, Held As Collateral + References No definition available. + Details
Name: | hwm_FinancingReceivablesHeldAsCollateral
Namespace Prefix: | hwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Schedule Of Financial Receivables [Line Items] + References No definition available. + Details
Name: | hwm_ScheduleOfFinancialReceivablesLineItems
Namespace Prefix: | hwm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of decrease from sale of accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-11 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_MajorCustomersAxis=hwm_CertainCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |