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Receivables (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Certain Customers |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Accounts receivables sold | $ 183 | $ 171 |
Accounts receivable outstanding | 192 | 169 |
Receivables Purchase Agreement |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Accounts receivable securitization following a provision to increase the limit | 325 |  |
Accounts receivable securitization | 250 |  | $ 250
Accounts receivable securitization amount drawn | 250 |  | 250
Financing receivables, held as collateral | 297 |  | $ 201
Accounts receivables sold | $ 470 | $ 413 |

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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
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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 After Provision To Increase Limit + 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, Sale, Amount Outstanding + 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 Financing Receivables, Held As Collateral + 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 Schedule Of Financial Receivables [Line Items] + References No definition available. + Details
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Namespace Prefix: | hwm_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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: |