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Income Taxes - Reconciliation of U.S. Federal Statutory Rate to Arconic's Effective Tax Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
U.S. federal statutory rate |  | 21.00% | 21.00% | 21.00%
Foreign tax rate differential |  | (1.40%) | 10.60% | 3.20%
U.S. and residual tax on foreign earnings |  | 5.60% | 15.30% | 5.50%
U.S. State and local taxes |  | 2.20% | 0.80% | (0.40%)
Federal (cost) benefit of state tax |  | (2.00%) | 1.20% | 0.40%
Permanent differences related to asset disposals and items included in restructuring and other charges |  | 6.80% | (1.30%) | (34.30%)
Non-deductible officer compensation |  | (3.50%) | (4.90%) | (0.30%)
Statutory tax rate and law changes |  | (15.90%) | (0.60%) | 13.20%
Tax holidays |  | (0.40%) | (8.20%) | (3.00%)
Changes in valuation allowances |  | 74.80% | (52.20%) | (1.30%)
Changes in uncertain tax positions |  | (116.90%) | 0.30% | 26.20%
Prior year tax adjustments |  | (1.70%) | 44.30% | (4.20%)
Other |  | 1.00% | 3.90% | 1.20%
Effective tax rate |  | (23.40%) | 40.00% | 27.80%
Foreign recapture |  |  |  | $ 74
Tax law change |  | $ 30 |  |
Income tax expense benefit | $ 272 |  |  | 59
Favorable spanish tax case decision |  | 104 |  |
Foreign tax credits amount released |  |  | $ 112 |
Reserve liability |  | 64 |  |
Tax position |  | $ 30 |  |
Foreign reserve |  |  |  | $ 38
Write off |  |  | 112 |
Tax benefit deduction |  |  | $ 24 |

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