XML 67 R51.htm IDEA: XBRL DOCUMENT
v3.20.2

Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | $ 1,134 | $ 1,794 | $ 4,021 | $ 5,364
Third-party sales |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 1,134 | 1,794 | 4,019 | 5,372
Third-party sales | Engine Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 485 | 844 | 1,851 | 2,492
Third-party sales | Fastening Systems |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 271 | 391 | 982 | 1,185
Third-party sales | Engineered Structures |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 206 | 318 | 710 | 943
Third-party sales | Forged Wheels |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 172 | 241 | 476 | 752
Third-party sales | Aerospace - Commercial |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 472 | 1,064 | 2,100 | 3,164
Third-party sales | Aerospace - Commercial | Engine Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 199 | 571 | 1,018 | 1,689
Third-party sales | Aerospace - Commercial | Fastening Systems |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 169 | 267 | 650 | 803
Third-party sales | Aerospace - Commercial | Engineered Structures |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 104 | 226 | 432 | 672
Third-party sales | Aerospace - Commercial | Forged Wheels |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 0 | 0 | 0 | 0
Third-party sales | Aerospace - Defense |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 261 | 226 | 730 | 659
Third-party sales | Aerospace - Defense | Engine Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 142 | 120 | 394 | 350
Third-party sales | Aerospace - Defense | Fastening Systems |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 37 | 41 | 120 | 115
Third-party sales | Aerospace - Defense | Engineered Structures |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 82 | 65 | 216 | 194
Third-party sales | Aerospace - Defense | Forged Wheels |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 0 | 0 | 0 | 0
Third-party sales | Commercial Transportation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 210 | 305 | 594 | 950
Third-party sales | Commercial Transportation | Engine Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 0 | 5 | 0 | 17
Third-party sales | Commercial Transportation | Fastening Systems |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 38 | 59 | 118 | 179
Third-party sales | Commercial Transportation | Engineered Structures |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 0 | 0 | 0 | 0
Third-party sales | Commercial Transportation | Forged Wheels |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 172 | 241 | 476 | 754
Third-party sales | Industrial and Other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 191 | 199 | 595 | 599
Third-party sales | Industrial and Other | Engine Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 144 | 148 | 439 | 436
Third-party sales | Industrial and Other | Fastening Systems |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 27 | 24 | 94 | 88
Third-party sales | Industrial and Other | Engineered Structures |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | 20 | 27 | 62 | 77
Third-party sales | Industrial and Other | Forged Wheels |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales: | $ 0 | $ 0 | $ 0 | $ (2)

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

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ConsolidationItemsAxis=arnc_OperatingSegmentsAndCorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

X
- Details
Name: | srt_ProductOrServiceAxis=arnc_AerospaceCommercialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=arnc_AerospaceDefenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=arnc_CommercialTransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=arnc_IndustrialAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |