Basis of Presentation (Policies)	6 Months Ended
Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The interim Consolidated Financial Statements of Howmet Aerospace Inc. and its subsidiaries (“Howmet” or the “Company” or “we” or “our”) are unaudited. These Consolidated Financial Statements include all adjustments, consisting only of normal recurring adjustments, considered necessary by management to fairly state the Company’s results of operations, financial position, and cash flows. The results reported in these Consolidated Financial Statements are not necessarily indicative of the results that may be expected for the entire year. The 2024 year-end balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). This Form 10-Q report should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2024 (the “Form 10-K”), which includes all disclosures required by GAAP. Certain amounts in previously issued financial statements were reclassified to conform to the current period presentation. In the six months ended June 30, 2025, the Company derived approximately 69% of its revenue from products sold to the commercial and defense aerospace markets. Aircraft production in the aerospace industry continues to grow based on increases in demand for new aircraft and engine spares. Aircraft backlogs remain at record levels despite the recent tariff announcements. We expect our aerospace demand to continue to grow, including engine spares. The Boeing Company (“Boeing”) has been gradually increasing its production rates over the past several months, and Airbus SE (“Airbus”) has also signaled that its production rates are increasing, particularly in narrow body aircraft. The Federal Aviation Administration stated that it will not approve production rate increases above 38 aircraft per month or additional production lines for the Boeing 737 MAX until it is satisfied that Boeing is in full compliance with required quality control procedures. Boeing and Airbus are the primary original equipment manufacturers (“OEMs”) of aircraft airframes, and these companies’ production levels have had and are expected to have a material impact on the financial performance of Howmet. The timing and level of future aircraft builds by OEMs are subject to changes and uncertainties, which may cause our future results to differ from prior periods due to changes in product mix in certain segments. Recent, ongoing changes in U.S. and international government policies, including executive orders on tariffs and retaliatory trade measures, are expected to impact the pricing of our products, disrupt supply chains, and increase our costs. The timing, extent, application, and level of tariffs by various governments and our ability to recover tariffs are subject to changes and uncertainties in all segments. While the tariff situation remains fluid, we expect to pass along the costs associated with tariffs to our customers in the form of a cost pass through mechanism. There may be a delay between an increase in our costs and our ability to recover the higher costs that could impact our margins. The preparation of the Consolidated Financial Statements of the Company in conformity with GAAP requires management to make certain judgments, estimates, and assumptions. These estimates are based on historical experience and, in some cases, assumptions based on current and future market expectations, including considerations relating to changes in the aerospace industry. The impact of these changes, including the macroeconomic considerations, remains highly uncertain. Management has made its best estimates using all relevant information available at the time, but it is possible that our estimates will differ from our actual results and affect the Consolidated Financial Statements in future periods and potentially require adverse adjustments to the recoverability of goodwill, intangible and long-lived assets, the realizability of deferred tax assets and other judgments and estimations and assumptions.
Recently Issued Accounting Guidance	Recently Adopted and Recently Issued Accounting Guidance Adopted In November 2023, the Financial Accounting Standards Board (“FASB”) issued guidance to enhance disclosures related to significant segment expenses and other matters related to reportable segments. These changes became effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The adoption of this new disclosure is reflected in Note C of the Consolidated Financial Statements. Issued In November 2024, the FASB issued guidance to improve disclosures about an entity’s expenses including more detailed information about the components of expenses in commonly presented expense captions. These changes become effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Management is currently evaluating the impact of these changes on the Consolidated Financial Statements. In December 2023, the FASB issued guidance to enhance the transparency of annual income tax disclosures including additional details on the rate reconciliation and taxes paid by jurisdiction. These changes are effective for fiscal years beginning after December 15, 2024. Management is currently evaluating the impact of these changes on the Consolidated Financial Statements and expects to disclose additional information as required by the standard.
Earnings Per Share	Basic earnings per share (“EPS”) amounts are computed by dividing earnings, after the deduction of preferred stock dividends declared, by the average number of common shares outstanding. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive share equivalents outstanding.

Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The interim Consolidated Financial Statements of Howmet Aerospace Inc. and its subsidiaries (“Howmet” or the “Company” or “we” or “our”) are unaudited. These Consolidated Financial Statements include all adjustments, consisting only of normal recurring adjustments, considered necessary by management to fairly state the Company’s results of operations, financial position, and cash flows. The results reported in these Consolidated Financial Statements are not necessarily indicative of the results that may be expected for the entire year. The 2024 year-end balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). This Form 10-Q report should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2024 (the “Form 10-K”), which includes all disclosures required by GAAP. Certain amounts in previously issued financial statements were reclassified to conform to the current period presentation.

In the six months ended June 30, 2025, the Company derived approximately 69% of its revenue from products sold to the commercial and defense aerospace markets. Aircraft production in the aerospace industry continues to grow based on increases in demand for new aircraft and engine spares. Aircraft backlogs remain at record levels despite the recent tariff announcements. We expect our aerospace demand to continue to grow, including engine spares. The Boeing Company (“Boeing”) has been gradually increasing its production rates over the past several months, and Airbus SE (“Airbus”) has also signaled that its production rates are increasing, particularly in narrow body aircraft. The Federal Aviation Administration stated that it will not approve production rate increases above 38 aircraft per month or additional production lines for the Boeing 737 MAX until it is satisfied that Boeing is in full compliance with required quality control procedures. Boeing and Airbus are the primary original equipment manufacturers (“OEMs”) of aircraft airframes, and these companies’ production levels have had and are expected to have a material impact on the financial performance of Howmet. The timing and level of future aircraft builds by OEMs are subject to changes and uncertainties, which may cause our future results to differ from prior periods due to changes in product mix in certain segments.

Recent, ongoing changes in U.S. and international government policies, including executive orders on tariffs and retaliatory trade measures, are expected to impact the pricing of our products, disrupt supply chains, and increase our costs. The timing, extent, application, and level of tariffs by various governments and our ability to recover tariffs are subject to changes and uncertainties in all segments. While the tariff situation remains fluid, we expect to pass along the costs associated with tariffs to our customers in the form of a cost pass through mechanism. There may be a delay between an increase in our costs and our ability to recover the higher costs that could impact our margins.

The preparation of the Consolidated Financial Statements of the Company in conformity with GAAP requires management to make certain judgments, estimates, and assumptions. These estimates are based on historical experience and, in some cases, assumptions based on current and future market expectations, including considerations relating to changes in the aerospace industry. The impact of these changes, including the macroeconomic considerations, remains highly uncertain. Management has made its best estimates using all relevant information available at the time, but it is possible that our estimates will differ from our actual results and affect the Consolidated Financial Statements in future periods and potentially require adverse adjustments to the recoverability of goodwill, intangible and long-lived assets, the realizability of deferred tax assets and other judgments and estimations and assumptions.

Recently Issued Accounting Guidance

Recently Adopted and Recently Issued Accounting Guidance

Adopted

In November 2023, the Financial Accounting Standards Board (“FASB”) issued guidance to enhance disclosures related to significant segment expenses and other matters related to reportable segments. These changes became effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The adoption of this new disclosure is reflected in Note C of the Consolidated Financial Statements.

Issued

In November 2024, the FASB issued guidance to improve disclosures about an entity’s expenses including more detailed information about the components of expenses in commonly presented expense captions. These changes become effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Management is currently evaluating the impact of these changes on the Consolidated Financial Statements.

In December 2023, the FASB issued guidance to enhance the transparency of annual income tax disclosures including additional details on the rate reconciliation and taxes paid by jurisdiction. These changes are effective for fiscal years beginning after December 15, 2024. Management is currently evaluating the impact of these changes on the Consolidated Financial Statements and expects to disclose additional information as required by the standard.

Earnings Per Share

Basic earnings per share (“EPS”) amounts are computed by dividing earnings, after the deduction of preferred stock dividends declared, by the average number of common shares outstanding. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive share equivalents outstanding.