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Arconic Inc. Separation Transaction and Discontinued Operations - Narrative (Details) |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2020 company | Mar. 25, 2020 USD ($) | Feb. 01, 2020 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 01, 2020 USD ($) | Feb. 07, 2020 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of independent, publicly-traded companies resulting from proposed separation transaction | company | 2 |  |  |  |  |  |  |  |  |  |
Separation, share distribution ratio | 0.25 |  |  |  |  |  |  |  |  |  |
Debt issuance costs incurred |  |  |  |  |  |  |  | $ 61,000,000 | $ 0 |  |
Non-cash asset impairments |  |  |  | $ 0 |  | $ 8,000,000 |  | 0 | $ 442,000,000 |  |
Distributions to Arconic Corp |  |  |  | 0 |  |  |  | (1,255,000,000) |  |  |
Accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions to Arconic Corp |  |  |  | (22,000,000) |  |  |  | 1,370,000,000 |  |  |
Additional capital |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions to Arconic Corp |  |  |  | $ 22,000,000 |  |  |  | (2,611,000,000) |  |  |
Aluminum Rolling Mill |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, consideration |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Gain on sale of business |  |  | $ 59,000,000 |  |  |  |  |  |  |  |
Non-cash asset impairments |  |  |  |  | $ 6,000,000 |  | $ 53,000,000 | 6,000,000 |  |  |
Hard Alloy Extrusions Plant In South Korea |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, consideration |  |  |  |  |  |  |  |  |  | $ 62,000,000 |
Lien Notes |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs incurred |  |  |  |  | $ 45,000,000 |  |  | $ 45,000,000 |  |  |
Senior Notes | Second Lien Notes Due 2028 |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 600,000,000
Long-term debt, interest rate (percentage) |  |  |  |  |  |  |  |  |  |  | 6.125%
Line of Credit | Senior Secured First Lien Term B Loan Facility Due 2027 | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 600,000,000 |  |  |  |  |  |  |  |  |
Credit Agreement term |  | 7 years |  |  |  |  |  |  |  |  |

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