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Arconic Inc. Separation Transaction - Narrative (Details) $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 01, 2020 company | May 05, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges (D) |  |  | $ 21 | $ 12
Subsequent Event |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of independent, publicly-traded companies resulting from proposed separation transaction | company | 2 |  |  |
Business separation | Separation Transaction [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Debt issuance costs incurred |  |  | 45 |
Capital expenditures |  |  | 3 |
Restructuring costs incurred to date |  |  | 116 |
Business separation | Separation Transaction [Member] | Subsequent Event |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Debt issuance costs incurred |  | $ 45 |  |
Capital expenditures |  | $ 10 |  |
Business separation | Separation Transaction [Member] | Selling, General and Administrative Expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges (D) |  |  | $ 38 |

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