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Income Taxes - Reconciliation of U.S. Federal Statutory Rate to Arconic's Effective Tax Rate (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
U.S. federal statutory rate |  |  | 21.00% | 21.00% | 35.00%
Foreign tax rate differential |  |  | 2.60% | 2.40% | (8.70%)
U.S. and residual tax on foreign earnings |  |  | 6.00% | 1.60% | (0.10%)
U.S. State and local taxes |  |  | 2.50% | 1.50% | 0.70%
Federal benefit of state tax |  |  | 0.40% | (0.30%) | 3.70%
Permanent differences on restructuring and other charges and asset disposals |  |  | (22.90%) | (16.90%) | (167.40%)
Non-deductible transaction costs |  |  | 1.60% | 0.00% | 0.30%
Non-deductible officer compensation |  |  | (1.80%) | (0.10%) | 0.00%
Statutory tax rate and law changes |  |  | (0.20%) | 6.50% | 52.50%
Tax holidays |  |  | (3.20%) | (1.60%) | (3.00%)
Changes in valuation allowances |  |  | (14.20%) | 0.90% | 137.90%
Impairment of goodwill |  |  | 0.00% | 0.00% | 53.50%
Changes in uncertain tax positions |  |  | 6.10% | 12.80% | 10.10%
Prior year tax adjustments |  |  | 15.20% | (2.60%) | (0.90%)
Other |  |  | 1.60% | 0.60% | 2.10%
Effective tax rate |  |  | 18.30% | 26.00% | 115.70%
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit) | $ 272 | $ 272 |  | $ 59 |

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