XML 122 R104.htm IDEA: XBRL DOCUMENT
v3.20.4

Receivables - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) agreement | Dec. 31, 2019 USD ($)
Schedule Of Financial Receivables [Line Items] |  |  |
Accounts receivable securitization arrangements | agreement |  | 2 |
Deferred purchase price receivable |  | $ 12 | $ 246
Net cash funding received during the period |  | 146 | 0
Amount of cash draws under arrangement during the period |  | 207 | 600
Amount of cash repayments under arrangement during the period |  | (353) | (600)
Total accounts receivable securitization arrangements |  | 425 | 400
Accounts receivable securitization, amount drawn |  | 250 | 350
Reduction in amount drawn |  | 100 |
Customer One |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Accounts receivable, sale |  | 32 |
Accounts receivable sale, amount outstanding |  | 0 |
Customer Two |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Accounts receivable, sale |  | 149 |
Accounts receivable sale, amount outstanding |  | 50 |
Arconic Corporation |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Deferred purchase price receivable | $ 282 |  |
Affiliated Entity |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Accounts receivable, sale |  | 165 |
Accounts receivable sale, amount outstanding |  | 46 | $ 0
Receivables, maximum purchase amount |  | 125 |
Financing receivables, held as collateral |  | 33 |
Maximum |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Funding of customer receivables sold | $ 300 | $ 400 |

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

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

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

X
- Definition Deferred purchase price customer receivables. + References No definition available. + Details
Name: | arnc_DeferredPriceCustomerReceivables
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Funding of customer receivables sold. + References No definition available. + Details
Name: | arnc_FundingOfCustomerReceivablesSold
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net cash funding received for development of reserves during the period. + References No definition available. + Details
Name: | arnc_NetCashFundingReceivedForDevelopmentOfReservesDuringThePeriod
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number Of Accounts Receivable Securitization Arrangements + References No definition available. + Details
Name: | arnc_NumberOfAccountsReceivableSecuritizationArrangements
Namespace Prefix: | arnc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds from receivable funding during the period. + References No definition available. + Details
Name: | arnc_ProceedsFromReceivableFundingDuringThePeriod
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Receivables, Maximum Purchase Amount + References No definition available. + Details
Name: | arnc_ReceivablesMaximumPurchaseAmount
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Repayments for receivable funding during the period. + References No definition available. + Details
Name: | arnc_RepaymentsForReceivableFundingDuringThePeriod
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of decrease from sale of accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447 + Details
Name: | us-gaap_AccountsReceivableSale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the amount owed to the reporting entity by counterparties in securitized loan transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInAccountsReceivableFromSecuritization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

X
- Details
Name: | dei_LegalEntityAxis=arnc_ArconicCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_AffiliatedEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |