XML 71 R58.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Receivables - Narrative (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 30, 2012 USD ($) | Mar. 31, 2018 USD ($) agreement | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Schedule Of Financial Receivables [Line Items] |  |  |  |
Number of arrangement with different financial institution to sell customer receivables | agreement |  | 3 |  |
Funding of customer receivables sold |  | $ 0 |  |
Sale of customer receivables | $ 304,000,000 |  |  |
Cash received for receivables | 50,000,000 | 136,000,000 | $ 95,000,000 |
Deferred purchase program receivable | $ 254,000,000 | 320,000,000 |  | $ 187,000,000
Net cash funding received during the period |  | 300,000,000 |  |
Amount of cash draws under arrangement during the period |  | 2,508,000,000 |  |
Amount of cash repayments under arrangement during the period |  | (2,208,000,000) |  |
Amount of cash draws under arrangement since inception |  | (150,000,000) |  |
Amount of cash repayments under arrangement since inception |  | 150,000,000 |  |
Cash outflow from deferred purchase receivable |  | 36,938,363,544 |  |
Cash collections of other receivables |  | (36,268,098,954) |  |
Minimum |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |
Funding of customer receivables sold |  | 200,000,000 |  |
Maximum |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |
Funding of customer receivables sold |  | $ 400,000,000 |  |

X
- Definition Cash Outflow From Deferred Purchase Receivable + References No definition available. + Details
Name: | arnc_CashOutflowFromDeferredPurchaseReceivable
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 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 arrangements to sell customer receivables. + References No definition available. + Details
Name: | arnc_NumberOfArrangementsToSellCustomerReceivables
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 Proceeds from receivable funding since inception. + References No definition available. + Details
Name: | arnc_ProceedsFromReceivableFundingSinceInception
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Repayments for receivable funding since inception. + References No definition available. + Details
Name: | arnc_RepaymentsForReceivableFundingSinceInception
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sale of customer receivables + References No definition available. + Details
Name: | arnc_SaleOfCustomerReceivables
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 cash inflow from the collection of receivables classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromCollectionOfOtherReceivables
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of receivables arising from the financing of goods and services. + References No definition available. + Details
Name: | us-gaap_ProceedsFromSaleOfFinanceReceivables
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |