XML 60 R43.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Restructuring and Other Charges - Schedule of Restructuring and Other Charges by Reportable Segments, Pretax (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 18 | $ 66 | $ 134 | $ 460
Operating Segments [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 12 | 57 | 131 | 422
Corporate [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 6 | 9 | 3 | 38
Alumina [Member] | Operating Segments [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | (1) | 38 | 3 | 55
Primary Metals [Member] | Operating Segments [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 17 | 11 | 105 | 209
Global Rolled Products [Member] | Operating Segments [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | (1) | (17) | 1 | 119
Engineered Products and Solutions [Member] | Operating Segments [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | (1) | 22 | 16 | 33
Transportation and Construction Solutions [Member] | Operating Segments [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ (2) | $ 3 | $ 6 | $ 6

X
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=arnc_AluminaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=arnc_PrimaryMetalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=arnc_GlobalRolledProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=arnc_EngineeredProductsAndSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=arnc_TransportationAndConstructionSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |