XML 81 R64.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Receivables - Additional Information (Detail) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 30, 2012 USD ($) | Sep. 30, 2016 USD ($) Agreement | Dec. 31, 2015 USD ($)
Schedule Of Financial Receivables [Line Items] |  |  |
Number of arrangement with different financial institution to sell customer receivables | Agreement |  | 3 |
Deferred purchase price receivable | $ 254,000,000 | $ 162,000,000 | $ 249,000,000
Net cash funding received since inception |  | 350,000,000 |
Amount of cash draws under arrangement since inception |  | 1,608,000,000 |
Amount of cash repayments under arrangement since inception |  | 1,258,000,000 |
Net cash funding received during the period |  | 100,000,000 |
Amount of cash draws under arrangement during the period |  | 300,000,000 |
Amount of cash repayments under arrangement during the period |  | 200,000,000 |
Accounts receivables |  | 28,738,000,000 |
Cash collections of other receivables |  | 28,226,000,000 |
Minimum [Member] |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Funding of customer receivables sold |  | 200,000,000 |
Maximum [Member] |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Funding of customer receivables sold |  | $ 400,000,000 |

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 Gross accounts receivable sold since inception. + References No definition available. + Details
Name: | arnc_GrossAccountsReceivableSoldSinceInception
Namespace Prefix: | arnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Net cash funding received for development of reserves since inception. + References No definition available. + Details
Name: | arnc_NetCashFundingReceivedForDevelopmentOfReservesSinceInception
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 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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: 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=66902209&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromCollectionOfOtherReceivables
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: |