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Acquisitions and Divestitures (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 USD ($) | Apr. 02, 2018 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) employee | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and other charges |  |  |  | $ (2) |  | $ 19 |  | $ 20 | $ 118 |
Latin America Extrusions (LAE) | Disposed of by Sale |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, revenue |  |  |  |  |  | $ 30 |  | $ 25 | $ 86 |
Cash received on sale of operations |  | $ 5 |  |  |  |  |  |  |  |
Latin America Extrusions (LAE) | Disposed of by Sale | Divested Businesses |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  | $ 41 |  |  |  |  |
Texarkana, Texas Rolling Mill And Cast House | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Period of operationalizing rolling mill equipment of transaction closing date | 36 months |  |  |  |  |  |  |  |  |
Minimum required terms of leases on cast house building and equipment | 18 months |  |  |  |  |  |  |  |  |
Period of supply with aluminum | 24 months |  |  |  |  |  |  |  |  |
Texarkana, Texas Rolling Mill And Cast House | Subsequent Event | Ta Chen International, Inc. |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Period of services performed, processing of metal | 6 years |  |  |  |  |  |  |  |  |
Texarkana, Texas Rolling Mill And Cast House | Disposed of by Sale | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Cash received on sale of operations | $ 63 |  |  |  |  |  |  |  |  |
Disposal group, consideration | 302 |  |  |  |  |  |  |  |  |
Disposal group, consideration consideration | 50 |  |  |  |  |  |  |  |  |
Texarkana, Texas rolling mill | Disposed of by Sale | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration on sale of assets | 4 |  |  |  |  |  |  |  |  |
Texarkana, Texas rolling mill | Disposed of by Sale | Subsequent Event | Scenario, Forecast | Minimum |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on disposal | 150 |  |  |  |  |  |  |  |  |
Deferred gain on disposal | 85 |  |  |  |  |  |  |  |  |
Texarkana, Texas rolling mill | Disposed of by Sale | Subsequent Event | Scenario, Forecast | Maximum |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on disposal | 165 |  |  |  |  |  |  |  |  |
Deferred gain on disposal | $ 100 |  |  |  |  |  |  |  |  |
Slim Aluminium |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Cash expense related to sale of rolling mill |  |  | $ 10 |  |  |  |  |  |  |
Third party guarantee with a fair value related to environmental remediation |  |  | $ 5 |  |  |  |  |  |  |
Disposal group, including discontinued operation, revenue |  |  |  |  |  |  | $ 37 |  |  |
Number of employees | employee |  |  |  |  |  |  | 312 |  |  |
Slim Aluminium | Restructuring and Other Charges |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on sale of rolling mill |  |  |  |  |  |  | $ 60 |  |  |
Third-Party Sales | Building and Construction Systems |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, revenue |  |  |  |  |  |  |  |  |  | $ 1,070

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