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Arconic Inc Separation Transaction and Discontinued Operations - Additional Information (Details) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 25, 2020 USD ($) | Feb. 01, 2020 USD ($) | Oct. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 01, 2020 | Feb. 07, 2020 USD ($) | Jan. 01, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distribution rate |  |  |  |  |  |  |  |  | 0.25 |  |
Debt issuance costs (C and R) |  |  |  |  |  | $ 61,000,000 | $ 0 | $ 0 |  |  |
Gain (loss) on disposition of business, before tax |  |  |  |  |  | (8,000,000) | (63,000,000) | (43,000,000) |  |  |
Asset impairment charges |  |  |  |  |  | 5,000,000 | 442,000,000 | 9,000,000 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting |  |  |  |  |  |  |  |  |  |  | $ 73,000,000
Aluminum Rolling Mill |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business, before tax |  | $ (59,000,000) |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  | $ 6,000,000 | $ 53,000,000 | 6,000,000 |  |  |  |  |
Hard Alloy Extrusions Plant In South Korea |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  | 62,000,000 |  | 62,000,000 |  |  |  |  |
Texarkana, Texas Rolling Mill And Cast House |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business, before tax |  |  |  |  |  |  | $ 20,000,000 | 154,000,000 |  |  |
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 |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  | $ 5,000,000 |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  | $ 302,000,000 |  |  |  |  |  |  |  |
Proceeds from the sales of businesses |  |  | 63,000,000 |  |  |  |  |  |  |  |
Additional contingent consideration |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Lien Notes |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs (C and R) |  |  |  | $ 45,000,000 |  | $ 45,000,000 |  |  |  |  |
Senior Notes | Second-Lien Notes Due 2028 |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 600,000,000 |
Convertible notes, interest rate percentage |  |  |  |  |  |  |  |  |  | 6.125% |
Line of Credit | Senior Secured First Lien Term B Loan Facility Due 2027 | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 600,000,000 |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date | 7 years |  |  |  |  |  |  |  |  |  |

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