Cash Remitted from Sale of Customer Receivables

No definition available.

Name:	arnc_CashRemittedFromSaleOfCustomerReceivables
Namespace Prefix:	arnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Receivables Purchase Agreement

+ References

No definition available.

+ Details

Name:	arnc_ReceivablesPurchaseAgreement
Namespace Prefix:	arnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sale of Customer Receivables

+ References

No definition available.

+ Details

Name:	arnc_SaleOfCustomerReceivables
Namespace Prefix:	arnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Supplier Finance Program, Capacity

+ References

No definition available.

+ Details

Name:	arnc_SupplierFinanceProgramCapacity
Namespace Prefix:	arnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Supplier Finance Program, Termination Notice

+ References

No definition available.

+ Details

Name:	arnc_SupplierFinanceProgramTerminationNotice
Namespace Prefix:	arnc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow associated with the sale or collection of receivables arising from the financing of goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

+ Details

Name:	us-gaap_ProceedsFromSaleAndCollectionOfFinanceReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479468/405-50-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479468/405-50-50-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479468/405-50-50-3

+ Details

Name:	us-gaap_SupplierFinanceProgramLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Indicates line item in statement of financial position that includes obligation for supplier finance program.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479468/405-50-50-3

+ Details

Name:	us-gaap_SupplierFinanceProgramObligationStatementOfFinancialPositionExtensibleEnumeration
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant

- Definition

Period when payment is expected to be made to finance provider or intermediary in supplier finance program, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_SupplierFinanceProgramPaymentTimingPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	arnc_ArrangementTypeAxis=arnc_ReceivablesPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	arnc_ArrangementTypeAxis=arnc_USReceivablesPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	arnc_ArrangementTypeAxis=arnc_EuropeanReceivablesPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Receivables, Loans, Notes Receivable, and Others (Details) € in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 EUR (€)	Dec. 31, 2022
Supplier Finance Program [Line Items]
Supplier Finance Program, Termination Notice	30 days
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration]	Accounts Payable, Trade, Current		Accounts Payable, Trade, Current	Accounts Payable, Trade, Current
Maximum
Supplier Finance Program [Line Items]
Supplier Finance Program, Capacity	$ 225
Supplier Finance Program, Payment Timing, Period	120 days		120 days
Receivables Purchase Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sale of Customer Receivables	$ 184	$ 550
Proceeds from Sale and Collection of Finance Receivables		438
Cash Remitted from Sale of Customer Receivables	182	$ 425
U. S. Receivables Purchase Agreement \| Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables Purchase Agreement	225
European Receivables Purchase Agreement \| Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables Purchase Agreement	$ 46		€ 42.5