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Acquisitions and Divestitures (Details) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Oct. 31, 2018 USD ($) | Apr. 02, 2018 USD ($) employee | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Restructuring and other charges (D) |  |  |  | $ 12 | $ 7 |  |
Latin America Extrusions (LAE) |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Disposal group, consideration |  |  | $ 2 |  |  |  |
Purchase price allocation, subsequent years, remaining adjustments |  |  |  |  |  |  | $ 2
Number of employees | employee |  |  | 612 |  |  |  |
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 |  |  |  |  |  |  | 25
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 (D) |  |  |  |  |  | $ 41 |
Texarkana, Texas Rolling Mill And Cast House |  |  |  |  |  |  |
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 |  |  |  |  |
Gain (loss) on sale of business |  | $ 154 |  |  |  |  |
Contingent consideration |  |  |  | $ 45 |  |  | 5
Deferred gain on sale of property |  |  |  |  |  |  | $ 95
Texarkana, Texas Rolling Mill And Cast House | 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 months |  |  |  |  |
Texarkana, Texas Rolling Mill And Cast House | Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net book value of disposal |  | $ 63 |  |  |  |  |
Cash received on sale of operations |  | 302 |  |  |  |  |
Disposal group, consideration consideration |  | $ 50 |  |  |  |  |
Accounting Standards Update 2016-02 | Property, Plant and Equipment |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Effect on retained earnings | $ (24) |  |  |  |  |  |
Accounting Standards Update 2016-02 | Other Noncurrent Liabilities and Deferred Credits |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Effect on retained earnings | 119 |  |  |  |  |  |
Accounting Standards Update 2016-02 | Other Noncurrent Assets |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Effect on retained earnings | $ (22) |  |  |  |  |  |

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