10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended March 31, 2025

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ____ to _____

Commission File Number 1-37816

ALCOA CORPORATION

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	81-1789115 (I.R.S. Employer Identification No.)
201 Isabella Street, Suite 500, Pittsburgh, Pennsylvania (Address of principal executive offices)	15212-5858 (Zip Code)

412-315-2900

(Registrant’s telephone number, including area code)

Not applicable

(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.01 per share	AA	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

Indicate the number of shares outstanding of each of the registrant’s classes of stock, as of the latest practicable date.

Title or Class	Outstanding Shares as of April 28, 2025
Common Stock, par value $0.01 per share	258,902,338
Series A Convertible Preferred Stock, par value $0.01 per share	4,041,989

TABLE OF CONTENTS

PART I – FINANCIAL INFORMATION		1
Item 1.	Financial Statements	1
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	25
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	40
Item 4.	Controls and Procedures	40
PART II – OTHER INFORMATION		40
Item 1.	Legal Proceedings	40
Item 1A.	Risk Factors	40
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	41
Item 5.	Other Information	41
Item 6.	Exhibits	42
SIGNATURES		43

Cautionary Statement on Forward-Looking Statements

This report contains statements that relate to future events and expectations and as such constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include those containing such words as “aims,” “ambition,” “anticipates,” “believes,” “could,” “develop,” “endeavors,” “estimates,” “expects,” “forecasts,” “goal,” “intends,” “may,” “outlook,” “potential,” “plans,” “projects,” “reach,” “seeks,” “sees,” “should,” “strive,” “targets,” “will,” “working,” “would,” or other words of similar meaning. All statements by Alcoa Corporation that reflect expectations, assumptions or projections about the future, other than statements of historical fact, are forward-looking statements, including, without limitation, statements regarding forecasts concerning global demand growth for bauxite, alumina, and aluminum, and supply/demand balances; statements, projections or forecasts of future or targeted financial results, or operating performance (including our ability to execute on strategies related to environmental, social and governance matters); statements about strategies, outlook, and business and financial prospects; and statements about capital allocation and return of capital. These statements reflect beliefs and assumptions that are based on Alcoa Corporation’s perception of historical trends, current conditions, and expected future developments, as well as other factors that management believes are appropriate in the circumstances.

Forward-looking statements are not guarantees of future performance and are subject to known and unknown risks, uncertainties, and changes in circumstances that are difficult to predict. Although Alcoa Corporation believes that the expectations reflected in any forward-looking statements are based on reasonable assumptions, it can give no assurance that these expectations will be attained and it is possible that actual results may differ materially from those indicated by these forward-looking statements due to a variety of risks and uncertainties. Such risks and uncertainties include, but are not limited to: (a) the impact of global economic conditions on the aluminum industry and aluminum end-use markets; (b) volatility and declines in aluminum and alumina demand and pricing, including global, regional, and product-specific prices, or significant changes in production costs which are linked to LME or other commodities; (c) the disruption of market-driven balancing of global aluminum supply and demand by non-market forces; (d) competitive and complex conditions in global markets; (e) our ability to obtain, maintain, or renew permits or approvals necessary for our mining operations; (f) rising energy costs and interruptions or uncertainty in energy supplies; (g) unfavorable changes in the cost, quality, or availability of raw materials or other key inputs, or by disruptions in the supply chain; (h) economic, political, and social conditions, including the impact of trade policies, tariffs, and adverse industry publicity; (i) legal proceedings, investigations, or changes in foreign and/or U.S. federal, state, or local laws, regulations, or policies; (j) changes in tax laws or exposure to additional tax liabilities; (k) climate change, climate change legislation or regulations, and efforts to reduce emissions and build operational resilience to extreme weather conditions; (l) disruptions in the global economy caused by ongoing regional conflicts; (m) fluctuations in foreign currency exchange rates and interest rates, inflation and other economic factors in the countries in which we operate; (n) global competition within and beyond the aluminum industry; (o) our ability to achieve our strategies or expectations relating to environmental, social, and governance considerations; (p) claims, costs, and liabilities related to health, safety and environmental laws, regulations, and other requirements in the jurisdictions in which we operate; (q) liabilities resulting from impoundment structures, which could impact the environment or cause exposure to hazardous substances or other damage; (r) dilution of the ownership position of the Company’s stockholders, price volatility, and other impacts on the price of Alcoa common stock by the secondary listing of the Alcoa common stock on the Australian Securities Exchange; (s) our ability to obtain or maintain adequate insurance coverage; (t) our ability to execute on our strategy to reduce complexity and optimize our asset portfolio and to realize the anticipated benefits from announced plans, programs, initiatives relating to our portfolio, capital investments, and developing technologies; (u) our ability to integrate and achieve intended results from joint ventures, other strategic alliances, and strategic business transactions; (v) our ability to fund capital expenditures; (w) deterioration in our credit profile or increases in interest rates; (x) impacts on our current and future operations due to our indebtedness; (y) our ability to continue to return capital to our stockholders through the payment of cash dividends and/or the repurchase of our common stock; (z) cyber attacks, security breaches, system failures, software or application vulnerabilities, or other cyber incidents; (aa) labor market conditions, union disputes and other employee relations issues; (bb) a decline in the liability discount rate or lower-than-expected investment returns on pension assets; and (cc) the other risk factors discussed in Alcoa’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024 and other reports filed by Alcoa with the SEC. Alcoa cautions readers not to place undue reliance upon any such forward-looking statements, which speak only as of the date they are made. Alcoa disclaims any obligation to update publicly any forward-looking statements, whether in response to new information, future events or otherwise, except as required by applicable law. Market projections are subject to the risks described above and other risks in the market. Neither Alcoa nor any other person assumes responsibility for the accuracy and completeness of any of these forward-looking statements and none of the information contained herein should be regarded as a representation that the forward-looking statements contained herein will be achieved.

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements.

Alcoa Corporation and Subsidiaries

Statement of Consolidated Operations (unaudited)

(in millions, except per-share amounts)

	First quarter ended March 31,
	2025			2024
Sales (E)	$	3,369		$	2,599
Cost of goods sold (exclusive of expenses below)		2,438			2,404
Selling, general administrative, and other expenses		71			60
Research and development expenses		12			11
Provision for depreciation, depletion, and amortization		148			161
Restructuring and other charges, net (D)		5			202
Interest expense		53			27
Other (income) expenses, net (P)		(26	)		59
Total costs and expenses		2,701			2,924
Income (loss) before income taxes		668			(325	)
Provision for (benefit from) income taxes		120			(18	)
Net income (loss)		548			(307	)
Less: Net loss attributable to noncontrolling interest		—			(55	)
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA    CORPORATION	$	548		$	(252	)
EARNINGS PER SHARE ATTRIBUTABLE TO ALCOA    CORPORATION COMMON SHAREHOLDERS (F):
Basic	$	2.08		$	(1.41	)
Diluted	$	2.07		$	(1.41	)

The accompanying notes are an integral part of the consolidated financial statements.

1

Alcoa Corporation and Subsidiaries

Statement of Consolidated Comprehensive Income (unaudited)

(in millions)

	Alcoa Corporation					Noncontrolling interest					Total
	First quarter ended March 31,					First quarter ended March 31,					First quarter ended March 31,
	2025		2024			2025		2024			2025		2024
Net income (loss)	$	548	$	(252	)	$	—	$	(55	)	$	548	$	(307	)
Other comprehensive income (loss), net of tax (G):
Change in unrecognized net actuarial gain/loss    and prior service cost/benefit related to pension    and other postretirement benefits		5		9			—		1			5		10
Foreign currency translation adjustments		185		(122	)		—		(54	)		185		(176	)
Net change in unrecognized gains/losses on cash    flow hedges		16		130			—		—			16		130
Total Other comprehensive income (loss), net of tax		206		17			—		(53	)		206		(36	)
Comprehensive income (loss)	$	754	$	(235	)	$	—	$	(108	)	$	754	$	(343	)

The accompanying notes are an integral part of the consolidated financial statements.

2

Alcoa Corporation and Subsidiaries

Consolidated Balance Sheet (unaudited)

(in millions)

	March 31, 2025			December 31, 2024
ASSETS
Current assets:
Cash and cash equivalents (M)	$	1,202		$	1,138
Receivables from customers (I)		1,203			1,096
Other receivables		144			143
Inventories (J)		2,182			1,998
Fair value of derivative instruments (M)		38			25
Prepaid expenses and other current assets		438			514
Total current assets		5,207			4,914
Properties, plants, and equipment		19,982			19,550
Less: accumulated depreciation, depletion, and amortization		13,485			13,161
Properties, plants, and equipment, net		6,497			6,389
Investments (H)		1,011			980
Deferred income taxes		306			284
Fair value of derivative instruments (M)		11			—
Other noncurrent assets (P)		1,542			1,497
Total assets	$	14,574		$	14,064
LIABILITIES
Current liabilities:
Accounts payable, trade	$	1,629		$	1,805
Accrued compensation and retirement costs		318			362
Taxes, including income taxes		94			102
Fair value of derivative instruments (M)		258			263
Other current liabilities		665			788
Long-term debt due within one year (K & M)		75			75
Total current liabilities		3,039			3,395
Long-term debt, less amount due within one year (K & M)		2,573			2,470
Accrued pension benefits (L)		239			256
Accrued other postretirement benefits (L)		406			412
Asset retirement obligations		683			691
Environmental remediation (O)		169			182
Fair value of derivative instruments (M)		850			836
Noncurrent income taxes		53			9
Other noncurrent liabilities and deferred credits		644			656
Total liabilities		8,656			8,907
CONTINGENCIES AND COMMITMENTS (O)
MEZZANINE EQUITY
Noncontrolling interest (C)		103			—
EQUITY
Preferred stock		—			—
Common stock		3			3
Additional capital		11,548			11,587
Accumulated deficit		(801	)		(1,323	)
Accumulated other comprehensive loss (G)		(4,935	)		(5,110	)
Total equity		5,815			5,157
Total liabilities, mezzanine equity, and equity	$	14,574		$	14,064

The accompanying notes are an integral part of the consolidated financial statements.

3

Alcoa Corporation and Subsidiaries

Statement of Consolidated Cash Flows (unaudited)

(in millions)

	Three months ended March 31,
	2025			2024
CASH FROM OPERATIONS
Net income (loss)	$	548		$	(307	)
Adjustments to reconcile net income (loss) to cash from operations:
Depreciation, depletion, and amortization		148			161
Deferred income taxes		50			(63	)
Equity (income) loss, net of dividends (H)		(9	)		23
Restructuring and other charges, net (D)		5			202
Net loss from investing activities – asset sales (P)		3			11
Net periodic pension benefit cost (L)		5			3
Stock-based compensation		11			10
(Gain) loss on mark-to-market derivative financial contracts		(5	)		2
Other		35			20
Changes in assets and liabilities, excluding effects of divestitures and    foreign currency translation adjustments:
Increase in receivables		(85	)		(212	)
(Increase) decrease in inventories		(155	)		71
Decrease (increase) in prepaid expenses and other current assets		87			(6	)
Decrease in accounts payable, trade		(206	)		(98	)
Decrease in accrued expenses		(206	)		(22	)
(Decrease) increase in taxes, including income taxes		(27	)		18
Pension contributions (L)		(12	)		(6	)
(Increase) decrease in noncurrent assets		(47	)		9
Decrease in noncurrent liabilities		(65	)		(39	)
CASH PROVIDED FROM (USED FOR) OPERATIONS		75			(223	)
FINANCING ACTIVITIES
Additions to debt (K)		1,033			965
Payments on debt (K)		(946	)		(221	)
Dividends paid on Alcoa common stock		(26	)		(19	)
Payments related to tax withholding on stock-based compensation awards		(5	)		(15	)
Financial contributions for the divestiture of businesses (C)		(2	)		(7	)
Contributions from noncontrolling interest (C)		27			61
Distributions to noncontrolling interest		—			(6	)
Other		(4	)		(4	)
CASH PROVIDED FROM FINANCING ACTIVITIES		77			754
INVESTING ACTIVITIES
Capital expenditures		(93	)		(101	)
Proceeds from the sale of assets		—			1
Additions to investments		(15	)		(17	)
CASH USED FOR INVESTING ACTIVITIES		(108	)		(117	)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH    EQUIVALENTS AND RESTRICTED CASH		12			(6	)
Net change in cash and cash equivalents and restricted cash		56			408
Cash and cash equivalents and restricted cash at beginning of year		1,234			1,047
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT    END OF PERIOD	$	1,290		$	1,455

The accompanying notes are an integral part of the consolidated financial statements.

4

Alcoa Corporation and Subsidiaries

Statement of Changes in Consolidated Mezzanine Equity and Equity (unaudited)

(in millions)

	Mezzanine equity		Alcoa Corporation shareholders
	Non- controlling interest		Preferred stock		Common stock		Additional capital			Accumulated deficit			Accumulated other comprehensive (loss) income			Non- controlling interest			Total equity
Balance at January 1, 2024	$	—	$	—	$	2	$	9,187		$	(1,293	)	$	(3,645	)	$	1,594		$	5,845
Net loss		—		—		—		—			(252	)		—			(55	)		(307	)
Other comprehensive income (loss) (G)		—		—		—		—			—			17			(53	)		(36	)
Stock-based compensation		—		—		—		10			—			—			—			10
Net effect of tax withholding for    compensation plans and    exercise of stock options		—		—		—		(15	)		—			—			—			(15	)
Dividends paid on Alcoa common    stock ($0.10 per share)		—		—		—		—			(19	)		—			—			(19	)
Contributions		—		—		—		—			—			—			61			61
Distributions		—		—		—		—			—			—			(6	)		(6	)
Other		—		—		—		2			—			—			(1	)		1
Balance at March 31, 2024	$	—	$	—	$	2	$	9,184		$	(1,564	)	$	(3,628	)	$	1,540		$	5,534
Balance at January 1, 2025	$	—	$	—	$	3	$	11,587		$	(1,323	)	$	(5,110	)	$	—		$	5,157
Net income		—		—		—		—			548			—			—			548
Other comprehensive income (G)		—		—		—		—			—			206			—			206
Stock-based compensation		—		—		—		11			—			—			—			11
Net effect of tax withholding for    compensation plans and    exercise of stock options		—		—		—		(5	)		—			—			—			(5	)
Dividends paid on Alcoa preferred    stock ($0.10 per share)		—		—		—		—			—			—			—			—
Dividends paid on Alcoa common    stock ($0.10 per share)		—		—		—		—			(26	)		—			—			(26	)
Joint venture formation (C)		103		—		—		(45	)		—			(31	)		—			(76	)
Balance at March 31, 2025	$	103	$	—	$	3	$	11,548		$	(801	)	$	(4,935	)	$	—		$	5,815

The accompanying notes are an integral part of the consolidated financial statements.

5

Alcoa Corporation and Subsidiaries

Notes to the Consolidated Financial Statements (unaudited)

(dollars in millions, except per-share amounts; metric tons in thousands (kmt))

A. Basis of Presentation – The interim Consolidated Financial Statements of Alcoa Corporation and its subsidiaries (Alcoa Corporation, Alcoa, or the Company) 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 Quarterly Report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, which includes disclosures required by GAAP.

In accordance with GAAP, certain situations require management to make estimates based on judgments and assumptions, which may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements. They also may affect the reported amounts of revenues and expenses during the reporting periods. Management uses historical experience and all available information to make these estimates. Management regularly evaluates the judgments and assumptions used in its estimates, and results could differ from those estimates upon future events and their effects or new information.

Principles of Consolidation. The Consolidated Financial Statements of the Company include the accounts of Alcoa Corporation and companies in which Alcoa Corporation has a controlling interest, including those that comprise the San Ciprián joint venture (see Note C). Intercompany transactions have been eliminated. The equity method of accounting is used for investments in affiliates and other joint ventures over which the Company has significant influence but does not have effective control. Investments in affiliates in which Alcoa Corporation cannot exercise significant influence are accounted for at cost less any impairment, a measurement alternative in accordance with GAAP.

Prior to Alcoa’s acquisition of Alumina Limited on August 1, 2024 (see Note C), Alcoa consolidated its 60% ownership in the entities comprising the Alcoa World Alumina & Chemicals (AWAC) joint venture and Alumina Limited’s interest in the equity of such entities was reflected as Noncontrolling interest within Equity on the accompanying Consolidated Balance Sheet.

B. Recently Adopted and Recently Issued Accounting Guidance

In November 2024, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (ASU) No. 2024-03 which requires detailed disclosures about the types of expenses (including purchases of inventory, employee compensation, depreciation, amortization, and depletion) included within commonly presented expense captions (including cost of goods sold; selling, general administrative, and other expense; and research and development expenses). The guidance is effective for annual periods beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. The adoption of this guidance will not have a material impact on the Company’s financial position or results of operations and will provide enhanced disclosures regarding expenses beginning in the Company’s Annual Report on Form 10-K for the year ended December 31, 2027.

In December 2023, the FASB issued ASU No. 2023-09 which includes changes to income tax disclosures, including greater disaggregation of information in the rate reconciliation and disclosure of taxes paid by jurisdiction. The guidance is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The adoption of this guidance will not have a material impact on the Company’s financial position or results of operations and will provide enhanced disclosures regarding income taxes beginning in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025.

6

C. Acquisitions and Divestitures

San Ciprián Joint Venture

On March 31, 2025, Alcoa and IGNIS Equity Holdings, SL (IGNIS EQT) entered into a joint venture agreement whereby Alcoa owns 75% and continues as the managing operator and IGNIS EQT owns 25% of the San Ciprián operations.

Alcoa and IGNIS EQT contributed $81 (€75) and $27 (€25), respectively, to form the joint venture. Additionally, up to approximately $108 (€100) may be funded by Alcoa as needed for operations with a priority position in future cash returns. Further funding requires agreement by both partners and would be shared 75% by Alcoa and 25% by IGNIS EQT.

The transaction was accounted for as an equity transaction where IGNIS EQT’s noncontrolling interest was reflected as a decrease to Additional capital on the accompanying Consolidated Balance Sheet. Noncontrolling interest was measured at 25% of the net assets included in the joint venture at formation ($103), which includes the contributions described above ($108). Additionally, certain amounts related to foreign currency translation adjustments previously included within Accumulated other comprehensive loss ($31) were reclassified to Additional capital.

Under the terms of the joint venture agreement, IGNIS EQT has a put option whereby IGNIS EQT can require Alcoa Corporation to purchase from IGNIS EQT its 25% interest at the then fair market value upon certain change in control provisions. Alcoa classified the Noncontrolling interest within Mezzanine equity on the Consolidated Balance Sheet, as IGNIS EQT’s redemption is not solely within the Company’s control. Alcoa will recognize earnings attributable to IGNIS EQT’s ownership interest within Noncontrolling interest beginning in the second quarter of 2025.

Alumina Limited Acquisition

On August 1, 2024, Alcoa completed the acquisition of all of the ordinary shares of Alumina Limited (Alumina Shares) through a wholly-owned subsidiary, AAC Investments Australia 2 Pty Ltd. At acquisition, Alumina Limited held a 40% ownership interest in the AWAC joint venture, consisting of several affiliated operating entities, which own, have an interest in, or operate the bauxite mines and alumina refineries within Alcoa Corporation’s Alumina segment (except for the Poços de Caldas mine and refinery and portions of the São Luís refinery, all in Brazil) and a portion (55%) of the Portland smelter (Australia) within Alcoa Corporation’s Aluminum segment. Upon completion of the Alumina Limited acquisition, Alumina Limited and, as a result, the operations held by the AWAC joint venture, became wholly-owned subsidiaries of Alcoa Corporation.

Earnings attributable to Alumina Limited’s ownership interest were recognized within Noncontrolling interest through July 31, 2024.

Saudi Arabia Joint Venture

On September 15, 2024, Alcoa entered into a share purchase and subscription agreement with Saudi Arabian Mining Company (Ma’aden), pursuant to which Alcoa agreed to sell its full ownership interest of 25.1% in the Saudi Arabia joint venture, comprised of the Ma’aden Bauxite and Alumina Company and the Ma’aden Aluminium Company, to Ma’aden in exchange for issuance by Ma’aden of 85,977,547 shares and $150 in cash. The implied value of the shares was $950 as of September 12, 2024, based on the volume-weighted average share price of Ma’aden for the previous 30 calendar days. The shares of Ma’aden will be subject to transfer and sale restrictions, including a restriction requiring Alcoa to hold its Ma’aden shares for a minimum of three years, with one-third of the shares becoming transferable after each of the third, fourth, and fifth anniversaries of closing of the transaction (the holding period). During the holding period, Alcoa would be permitted to hedge and borrow against its Ma’aden shares. Under certain circumstances, such minimum holding period would be reduced. The transaction is subject to regulatory approvals, approval by Ma’aden’s shareholders, and other customary closing conditions and is expected to close in the second quarter of 2025. The carrying value of Alcoa’s investment was $553 as of March 31, 2025. The transaction is subject to capital gains tax in Saudi Arabia of approximately $65 based on the implied value of the shares as of September 12, 2024.

Warrick Rolling Mill Divestiture

In March 2021, Alcoa completed the sale of its rolling mill located at Warrick Operations (Warrick Rolling Mill) and recorded estimated liabilities for site separation commitments. In the first quarters of 2025 and 2024, the Company spent $2 and $7 against the reserve, respectively. In the first quarter of 2024, the Company recorded a charge of $11 in Other (income) expenses, net on the Statement of Consolidated Operations related to these commitments. The remaining balance of $6 at March 31, 2025 is expected to be spent in 2025. The cash spent against the reserve is included in Cash provided from financing activities on the Statement of Consolidated Cash Flows.

7

D. Restructuring and Other Charges, Net

In the first quarter of 2025, Alcoa Corporation recorded Restructuring and other charges, net, of $5 which were primarily comprised of:

•A charge of $3 for certain employee obligations related to the February 2023 updated viability agreement reached with the workers’ representatives of the San Ciprián aluminum smelter related to the restart of the smelter; and,

•A charge of $2 for take-or-pay contract costs at a previously closed site.

In the first quarter of 2024, Alcoa Corporation recorded Restructuring and other charges, net, of $202 which were primarily comprised of a charge of $197 for the curtailment of the Kwinana (Australia) alumina refinery.

In June 2024, Alcoa completed the full curtailment of the Kwinana refinery, as planned, which was announced in January 2024. As of March 2025, the refinery had approximately 240 employees to manage certain processes that are expected to continue until about the fourth quarter of 2025. At that time, the employee number will be further reduced to approximately 50. In the first quarter of 2024, the Company recorded charges of $197 in Restructuring and other charges, net on the Statement of Consolidated Operations comprised of other costs of $136 for water management costs ($123) and take-or-pay contracts ($13), severance and employee termination costs of $41, asset retirement obligations of $15, and asset impairments of $5. The Company recorded net charges of $8 and $82 in Restructuring and other charges, net on the Statement of Consolidated Operations in the second quarter and fourth quarter of 2024, respectively, comprised of others costs of $96, partially offset by an adjustment to decrease the asset retirement obligation by $6. Payments related to other costs were $41 in the first quarter of 2025. Remaining cash outlays of approximately $100 are expected to be spent in 2025.

Alcoa Corporation does not include Restructuring and other charges, net in the results of its reportable segments. The impact of allocating such charges to segment results would have been as follows:

	First quarter ended March 31,
	2025		2024
Alumina	$	—	$	197
Aluminum		3		—
Segment total		3		197
Corporate		2		5
Total Restructuring and other charges, net	$	5	$	202

Activity and reserve balances for restructuring charges were as follows:

	Severance and employee termination costs			Other costs			Total
Balance at December 31, 2023	$	6		$	57		$	63
Restructuring and other charges, net		44			264			308
Cash payments		(38	)		(145	)		(183	)
Reversals and other		1			(8	)		(7	)
Balance at December 31, 2024		13			168			181
Restructuring and other charges, net		—			5			5
Cash payments		(1	)		(48	)		(49	)
Reversals and other		(1	)		4			3
Balance at March 31, 2025	$	11		$	129		$	140

The activity and reserve balances include only Restructuring and other charges, net that impacted the reserves for Severance and employee termination costs and Other costs. Restructuring and other charges, net that affected other liability accounts such as Accrued pension benefits (see Note L), Asset retirement obligations, and Environmental remediation (see Note O) are excluded from the above activity and balances. Reversals and other includes reversals of previously recorded liabilities and foreign currency translation impacts.

The noncurrent portion of the reserve was $9 and $8 at March 31, 2025 and December 31, 2024, respectively.

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E. Segment Information – Alcoa Corporation is a producer of bauxite, alumina, and aluminum products. The Company has two operating and reportable segments: (i) Alumina and (ii) Aluminum. The primary measure of performance reported to Alcoa Corporation’s President and Chief Executive Officer (identified as the Company’s CODM) is Adjusted EBITDA (Earnings before interest, taxes, depreciation, and amortization) for each segment.

The Company calculates Segment Adjusted EBITDA as Total sales (third-party and intersegment) minus the following items: Cost of goods sold; Selling, general administrative, and other expenses; and Research and development expenses. Alcoa Corporation’s Segment Adjusted EBITDA may not be comparable to similarly titled measures of other companies. The CODM regularly reviews Segment Adjusted EBITDA to assess performance and allocate resources (including employees, property, and financial or capital resources) in the planning and strategic review process.

The operating results, capital expenditures, and assets of Alcoa Corporation’s reportable segments were as follows (differences between segment totals and consolidated amounts are in Corporate):

	Alumina			Aluminum			Total
First quarter ended March 31, 2025
Sales:
Third-party sales	$	1,463		$	1,901		$	3,364
Intersegment sales		712			4			716
Total sales	$	2,175		$	1,905		$	4,080
Adjusted operating costs(1)		723			1,574			2,297
Other segment items(2)		788			197			985
Segment Adjusted EBITDA	$	664		$	134		$	798
Supplemental information:
Depreciation, depletion, and amortization	$	76		$	67		$	143
Equity income (loss)		15			(6	)		9
Capital expenditures		53			37			90
First quarter ended March 31, 2024
Sales:
Third-party sales	$	961		$	1,638		$	2,599
Intersegment sales		395			4			399
Total sales	$	1,356		$	1,642		$	2,998
Adjusted operating costs(1)		796			1,279			2,075
Other segment items(2)		421			313			734
Segment Adjusted EBITDA	$	139		$	50		$	189
Supplemental information:
Depreciation, depletion, and amortization	$	87		$	68		$	155
Equity (loss) income		(11	)		2			(9	)
Capital expenditures		57			41			98
March 31, 2025
Assets:
Equity investments	$	443		$	553		$	996
Segment assets		6,295			6,269			12,564
December 31, 2024
Assets:
Equity investments	$	420		$	546		$	966
Segment assets		6,138			6,129			12,267

(1)Adjusted operating costs include all production related costs for alumina or aluminum produced and shipped: raw materials consumed; conversion costs, such as labor, materials, and utilities; and plant administrative expenses.

(2)Other segment items include costs associated with trading activity, the Alumina segment’s purchase of bauxite from offtake or other supply agreements, the Alumina segment’s commercial shipping services, and the Aluminum segment’s energy assets; other direct and non-production related charges; Selling, general administrative, and other expenses; and Research and development expenses.

9

The following table reconciles Total Segment Adjusted EBITDA to Consolidated net income (loss) attributable to Alcoa Corporation:

	First quarter ended March 31,
	2025			2024
Total Segment Adjusted EBITDA	$	798		$	189
Unallocated amounts:
Transformation(1)		(12	)		(14	)
Intersegment eliminations		103			(8	)
Corporate expenses(2)		(37	)		(34	)
Provision for depreciation, depletion, and amortization		(148	)		(161	)
Restructuring and other charges, net (D)		(5	)		(202	)
Interest expense		(53	)		(27	)
Other income (expenses), net (P)		26			(59	)
Other(3)		(4	)		(9	)
Consolidated income (loss) before income taxes		668			(325	)
(Provision for) benefit from income taxes		(120	)		18
Net loss attributable to noncontrolling interest		—			55
Consolidated net income (loss) attributable to Alcoa Corporation	$	548		$	(252	)

(1)Transformation includes, among other items, the Adjusted EBITDA of previously closed operations.

(2)Corporate expenses are composed of general administrative and other expenses of operating the corporate headquarters and other global administrative facilities, as well as research and development expenses of the corporate technical center.

(3)Other includes certain items that are not included in the Adjusted EBITDA of the reportable segments.

The following table details Alcoa Corporation’s Sales by product division:

	First quarter ended March 31,
	2025			2024
Aluminum	$	1,955		$	1,661
Alumina		1,211			890
Bauxite		242			61
Energy		33			33
Other(1)		(72	)		(46	)
	$	3,369		$	2,599

(1)Other includes realized gains and losses related to embedded derivative instruments designated as cash flow hedges of forward sales of aluminum (see Note M).

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F. Earnings Per Share

Basic earnings per share (EPS) is calculated using the two-class method. Under the two-class method, earnings are allocated to Alcoa common stock and preferred stock based on the pro-rata share of each class outstanding. Diluted EPS assumes the issuance of common stock for all potentially dilutive share equivalents outstanding. Diluted EPS is calculated under both the two-class and if-converted methods, and the more dilutive amount is reported.

In the first quarter of 2025, undistributed earnings of $9 were allocated to preferred stock under the two-class method.

The share information used to compute basic and diluted EPS attributable to Alcoa Corporation common shareholders was as follows (shares in millions):

	First quarter ended March 31,
	2025		2024
Average shares outstanding – basic		259		179
Effect of dilutive securities:
Stock options		—		—
Stock units		1		—
Average shares outstanding – diluted		260		179

In the first quarter of 2024, basic average shares outstanding and diluted average shares outstanding were the same because the effect of potential shares of common stock was anti-dilutive. Had Alcoa generated net income in the first quarter of 2024, two million common share equivalents related to three million outstanding stock units and stock options combined would have been included in diluted average shares outstanding for the period.

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G. Accumulated Other Comprehensive Loss

The following table details the activity of the three components that comprise Accumulated other comprehensive loss for Alcoa Corporation’s shareholders and Noncontrolling interest:

	Alcoa Corporation						Noncontrolling interest
	First quarter ended March 31,						First quarter ended March 31,
	2025			2024			2025		2024
Pension and other postretirement benefits (L)
Balance at beginning of period	$	(11	)	$	—		$	—	$	(15	)
Other comprehensive (loss) income:
Unrecognized net actuarial gain/loss and    prior service cost/benefit		(1	)		4			—		—
Tax expense(2)		(1	)		(1	)		—		—
Total Other comprehensive (loss) income    before reclassifications, net of tax		(2	)		3			—		—
Amortization of net actuarial gain/loss and    prior service cost/benefit(1)		7			6			—		1
Total amount reclassified from Accumulated    other comprehensive loss, net of tax(4)		7			6			—		1
Total Other comprehensive income		5			9			—		1
Balance at end of period	$	(6	)	$	9		$	—	$	(14	)
Foreign currency translation
Balance at beginning of period	$	(4,194	)	$	(2,593	)	$	—	$	(983	)
Other comprehensive income (loss)		185			(122	)		—		(54	)
Joint venture formation (C)		(31	)		—			—		—
Balance at end of period	$	(4,040	)	$	(2,715	)	$	—	$	(1,037	)
Cash flow hedges (M)
Balance at beginning of period	$	(905	)	$	(1,052	)	$	—	$	—
Other comprehensive (loss) income:
Net change from periodic revaluations		(85	)		117			—		—
Tax benefit (expense)(2)		23			(31	)		—		—
Total Other comprehensive (loss) income    before reclassifications, net of tax		(62	)		86			—		—
Net amount reclassified to earnings:
Aluminum contracts(3)		93			57			—		—
Foreign exchange contracts(3)		2			(4	)		—		—
Sub-total		95			53			—		—
Tax expense(2)		(17	)		(9	)		—		—
Total amount reclassified from Accumulated    other comprehensive loss, net of tax(4)		78			44			—		—
Total Other comprehensive income		16			130			—		—
Balance at end of period	$	(889	)	$	(922	)	$	—	$	—
Total Accumulated other comprehensive loss	$	(4,935	)	$	(3,628	)	$	—	$	(1,051	)

(1)These amounts were included in the computation of net periodic benefit cost for pension and other postretirement benefits (see Note L).

(2)These amounts were reported in Provision for income taxes on the accompanying Statement of Consolidated Operations.

(3)These amounts were reported in Sales on the accompanying Statement of Consolidated Operations.

(4)A positive amount indicates a corresponding charge to earnings and a negative amount indicates a corresponding benefit to earnings.

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H. Investments – A summary of unaudited financial information for Alcoa Corporation’s equity investments is as follows (amounts represent 100% of investee financial information):

First quarter ended March 31, 2025	Saudi Arabia Joint Venture			Mining			Energy			Other
Sales	$	956		$	168		$	58		$	111
Cost of goods sold		775			104			22			100
Net income (loss)		13			19			29			(10	)
Equity in net income (loss) of affiliated companies,    before reconciling adjustments		3			9			11			(5	)
Other		6			—			—			(7	)
Alcoa Corporation’s equity in net income (loss) of    affiliated companies		9			9			11			(12	)
First quarter ended March 31, 2024
Sales	$	711		$	115		$	63		$	115
Cost of goods sold		599			103			25			105
Net (loss) income		(8	)		(5	)		31			(16	)
Equity in net (loss) income of affiliated companies,    before reconciling adjustments		(2	)		(2	)		12			(8	)
Other		(8	)		—			(1	)		(5	)
Alcoa Corporation’s equity in net (loss) income of    affiliated companies		(10	)		(2	)		11			(13	)

The Company’s basis in the ELYSISTM Limited Partnership (ELYSIS) as of March 31, 2025 and 2024, included in Other in the table above, has been reduced to zero for its share of losses incurred to date. As a result, the Company has $60 in unrecognized losses as of March 31, 2025 that will be recognized upon additional contributions into the partnership.

On September 15, 2024, Alcoa entered into a share purchase and subscription agreement with Ma’aden, pursuant to which Alcoa agreed to sell its full ownership interest of 25.1% in the Saudi Arabia joint venture, comprised of the Ma’aden Bauxite and Alumina Company and the Ma’aden Aluminium Company, to Ma’aden in exchange for issuance by Ma’aden of 85,977,547 shares and $150 in cash (see Note C).

I. Receivables

In November 2024, a wholly-owned special purpose entity (SPE) of the Company amended an agreement with a financial institution to increase the amount of certain customer receivables that can be transferred without recourse on a revolving basis from $130 to $150 and to extend the maturity to November 14, 2025. The agreement was initially entered into in 2023. Company subsidiaries sell customer receivables to the SPE, which then transfers the receivables to the financial institution. The Company does not maintain effective control over the transferred receivables, and therefore accounts for the transfers as sales of receivables.

Alcoa Corporation guarantees the performance obligations of the Company subsidiaries, and unsold customer receivables are pledged as collateral to the financial institution to secure the sold receivables. The SPE held unsold customer receivables of $331 and $247 pledged as collateral against the sold receivables as of March 31, 2025 and December 31, 2024, respectively.

The Company continues to service the customer receivables that were transferred to the financial institution. As Alcoa collects customer payments, the SPE transfers additional receivables to the financial institution rather than remitting cash.

In the first quarter of 2025, the Company sold gross customer receivables of $199 and reinvested collections of $199 from previously sold receivables, resulting in no net cash remittance to or proceeds from the financial institution. In the first quarter of 2024, the Company sold gross customer receivables of $307 and reinvested collections of $291 from previously sold receivables, resulting in net cash proceeds from the financial institution of $16.

Cash collections from previously sold receivables yet to be reinvested of $90 and $50 were included in Accounts payable, trade on the accompanying Consolidated Balance Sheet as of March 31, 2025 and December 31, 2024, respectively. Cash received from sold receivables under the agreement are presented within operating activities in the Statement of Consolidated Cash Flows.

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J. Inventories

	March 31, 2025		December 31, 2024
Finished goods	$	414	$	406
Work-in-process		276		251
Bauxite and alumina		657		551
Purchased raw materials		589		546
Operating supplies		246		244
	$	2,182	$	1,998

K. Debt

Short-term Borrowings

Inventory Repurchase Agreements

The Company entered into inventory repurchase agreements whereby the Company sold aluminum to a third party and agreed to subsequently repurchase substantially similar inventory. The Company did not record sales upon each shipment of inventory and the net cash received of $45 and $50 related to these agreements was recorded in Short-term borrowings within Other current liabilities on the Consolidated Balance Sheet as of March 31, 2025 and December 31, 2024, respectively. The associated inventory sold was reflected in Prepaid expenses and other current assets on the accompanying Consolidated Balance Sheet.

During the first quarter of 2025, the Company recorded borrowings of $44 and repurchased $49 of inventory related to these agreements. During the first quarter of 2024, the Company recorded borrowings of $21 and repurchased $25 of inventory related to these agreements.

The cash received and subsequently paid under the inventory repurchase agreements is included in Cash provided from financing activities on the Statement of Consolidated Cash Flows.

144A Debt

2030 and 2032 Notes

In March 2025, Alumina Pty Ltd, a wholly-owned subsidiary of Alcoa Corporation, completed Rule 144A (U.S. Securities Act of 1933, as amended) debt issuances of $500 aggregate principal amount of 6.125% Senior Notes due 2030 (the 2030 Notes) and $500 aggregate principal amount of 6.375% Senior Notes due 2032 (the 2032 Notes, and, collectively with the 2030 Notes, the Notes). The net proceeds of these issuances were $985, reflecting a discount to the initial purchasers of the Notes as well as issuance costs. The Company utilized certain proceeds of these transactions to fund contributions to Alcoa Nederland Holding B.V. (ANHBV), a wholly-owned subsidiary of Alcoa Corporation and the issuer of the outstanding $750 aggregate principal amount of 5.500% Notes due 2027 (the Existing 2027 Notes) and $500 aggregate principal amount of 6.125% Notes due 2028 (the Existing 2028 Notes). These contributions were funded through a series of intercompany transactions, including the repayment of intercompany indebtedness and the issuance of intercompany dividends. ANHBV used such funds, along with cash on hand, to fund the purchase price pursuant to the cash tender offers announced and settled in March 2025, including premiums and transaction costs (see Tender Offers). The net proceeds also support Alcoa’s general corporate purposes.

The discount to the initial purchasers of the Notes, as well as costs to complete the financing, were deferred and are being amortized to interest expense over the term of the Notes. Interest on the Notes is paid semi-annually in March and September, and interest payments will commence on September 15, 2025. The indentures contain customary affirmative and negative covenants that are similar to those included in the indenture that governs ANHBV’s 7.125% Senior Notes due 2031 issued in March 2024, such as limitations on liens, limitations on sale and leaseback transactions, and the calculation of certain financial ratios.

Alumina Pty Ltd has the option to redeem the Notes on at least 10 days, but not more than 60 days, notice to the holders of the Notes under multiple scenarios, including, in whole or in part, at any time or from time to time on and after March 15, 2027 and March 15, 2028 for the 2030 Notes and 2032 Notes, respectively, at the applicable redemption price specified in the indenture (up to 103.063% and 103.188% of the principal amount plus any accrued and unpaid interest in each case for the 2030 Notes and 2032 Notes, respectively). Also, the Notes are subject to repurchase upon the occurrence of a change in control repurchase event (as defined in the indenture) at a repurchase price in cash equal to 101% of the aggregate principal amount of the Notes repurchased, plus any accrued and unpaid interest on the Notes repurchased.

14

The Notes are guaranteed on a senior unsecured basis by the Company and its subsidiaries that are party to the indentures. The Notes and related guarantees rank equally in right of payment with all existing and future senior unsecured indebtedness of Alumina Pty Ltd, the Company, and such subsidiaries; rank senior in right of payment to any future subordinated obligations of Alumina Pty Ltd, the Company, and such subsidiaries; and are effectively subordinated to the existing and future secured indebtedness of Alumina Pty Ltd, the Company, and such subsidiaries, including under the Revolving Credit Agreement, to the extent of the value of property and assets securing such indebtedness.

See Part II Item 8 of Alcoa Corporation’s Annual Report on Form 10-K in Note M to the Consolidated Financial Statements for the year ended December 31, 2024 for more information related to the Company’s and such subsidiaries’ existing debt and related covenants.

Tender Offers

In March 2025, ANHBV announced and settled cash tender offers which resulted in the tender and acceptance of $609 of the $750 aggregate principal amount of Existing 2027 Notes and $281 of the $500 aggregate principal amount of Existing 2028 Notes for purchase. The issuance of the 2030 Notes and 2032 Notes and the cash tender of the Existing 2027 Notes and Existing 2028 Notes were determined to be issuances of new debt and extinguishments of existing debt. As a result, the Company incurred $12 of debt settlement expenses in the first quarter of 2025 in Interest expense, which was comprised of the settlement premiums, transaction costs, and the write-off of unamortized discounts and deferred financing costs. The cash flows related to the transaction were included in Cash provided from financing activities on the Statement of Consolidated Cash Flows.

Credit Facilities

Revolving Credit Facility

The Company and ANHBV, a wholly-owned subsidiary of Alcoa Corporation and the borrower, have a $1,250 revolving credit and letter of credit facility in place for working capital and/or other general corporate purposes (the Revolving Credit Facility). The Revolving Credit Facility, established in September 2016, most recently amended and restated in June 2022 and amended in January 2024, is scheduled to mature in June 2027. Subject to the terms and conditions under the Revolving Credit Facility, the Company or ANHBV may borrow funds or issue letters of credit. Under the terms of the January 2024 amendment, the Company agreed to provide collateral for its obligations under the Revolving Credit Facility. See Part II Item 8 of Alcoa Corporation’s Annual Report on Form 10-K in Note M to the Consolidated Financial Statements for the year ended December 31, 2024 for more information on the Revolving Credit Facility.

As of March 31, 2025, the Company was in compliance with all financial covenants. The Company may access the entire amount of commitments under the Revolving Credit Facility. There were no borrowings outstanding at March 31, 2025 and December 31, 2024, and no amounts were borrowed during the first quarters ended March 31, 2025 and March 31, 2024 under the Revolving Credit Facility.

Japanese Yen Revolving Credit Facility

The Company and ANHBV have a $250 revolving credit facility available to be drawn in Japanese yen (the Japanese Yen Revolving Credit Facility). Subject to the terms and conditions under the facility, the Company or ANHBV may borrow funds. The Japanese Revolving Credit Facility, established in April 2023 and amended in January 2024 and April 2024, includes covenants that are substantially the same as those included in the Revolving Credit Facility. Under the terms of the January 2024 amendment, the Company agreed to provide collateral for its obligations under the Japanese Yen Revolving Credit Facility. See Part II Item 8 of Alcoa Corporation’s Annual Report on Form 10-K in Note M to the Consolidated Financial Statements for the year ended December 31, 2024 for more information on the Japanese Yen Revolving Credit Facility.

As of March 31, 2025, the Company was in compliance with all financial covenants. The Company may access the entire amount of commitments under the Japanese Revolving Credit Facility. There were no borrowings outstanding at March 31, 2025 and December 31, 2024. During the first quarter of 2025, no amounts were borrowed. During the first quarter of 2024, $201 (29,686 JPY) was borrowed and $196 (29,686 JPY) was repaid under the Japanese Yen Revolving Credit Facility.

In April 2025, the Company and ANHBV entered into an amendment to the Japanese Yen Revolving Credit Facility, reducing the aggregate commitments from $250 to $200 and extending maturity from April 2025 to April 2026.

Other

In April 2025, the Company amended a $74 term loan extending maturity from May 2025 to November 2025.

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L. Pension and Other Postretirement Benefits

The components of net periodic benefit cost were as follows:

	Pension benefits						Other postretirement benefits
First quarter ended March 31,	2025			2024			2025			2024
Service cost	$	2		$	2		$	—		$	1
Interest cost(1)		25			27			5			6
Expected return on plan assets(1)		(31	)		(35	)		—			—
Recognized net actuarial loss(1)		9			8			1			1
Amortization of prior service benefit(1)		—			—			(3	)		(3	)
Curtailments(2)		—			1			—			—
Net periodic benefit cost	$	5		$	3		$	3		$	5

(1)These amounts were reported in Other (income) expenses, net on the accompanying Statement of Consolidated Operations (see Note P).

(2)This amount was reported in Restructuring and other charges, net on the accompanying Statement of Consolidated Operations and Cash Flows.

Funding and Cash Flows. It is Alcoa’s policy to fund amounts for defined benefit pension plans sufficient to meet the minimum requirements set forth in each applicable country’s benefits laws and tax laws, including the Employee Retirement Income Security Act of 1974 (ERISA) for U.S. plans. From time to time, the Company contributes additional amounts as deemed appropriate.

Under ERISA regulations, a plan sponsor that establishes a pre-funding balance by making discretionary contributions to a U.S. defined benefit pension plan may elect to apply all or a portion of this balance toward its minimum required contribution obligations to the related plan in future years.

In the first quarter of 2025, management made such elections related to the Company’s U.S. plans and intends to do so for the remainder of 2025. As a result, Alcoa’s minimum required contribution to defined benefit pension plans in 2025 is estimated to be approximately $19, of which $12 was contributed to non-U.S. plans during the first quarter of 2025.

In the first quarter of 2024, $6 was contributed to non-U.S. plans.

M. Derivatives and Other Financial Instruments

Fair Value

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy distinguishes between (i) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (ii) an entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below:

•Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

•Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

•Level 3 - Inputs that are both significant to the fair value measurement and unobservable.

Derivatives

Alcoa Corporation is exposed to certain risks relating to its ongoing business operations, including the risks of changing commodity prices, foreign currency exchange rates, and interest rates. Alcoa Corporation’s commodity and derivative activities include aluminum, energy, foreign exchange, and interest rate contracts, which are held for purposes other than trading. They are used to mitigate uncertainty and volatility, and to cover underlying exposures. While Alcoa does not generally enter into derivative contracts to mitigate the risk associated with changes in aluminum price, the Company may do so in isolated cases to address discrete commercial or operational conditions. Alcoa is not involved in trading activities for energy, weather derivatives, or other nonexchange commodities.

16

Alcoa Corporation’s commodity and derivative activities are subject to the management, direction, and control of the Strategic Risk Management Committee (SRMC), which consists of at least three members, including the chief executive officer, the chief financial officer, and the chief commercial officer. The remaining member(s) are other officers and/or employees of the Company as the chief executive officer may designate from time to time. The SRMC meets on a periodic basis to review derivative positions and strategy and reports to the Audit Committee of Alcoa Corporation’s Board of Directors on the scope of its activities.

During the first quarter of 2025, Alcoa entered into financial contracts with multiple counterparties to mitigate financial risks associated with changes in aluminum prices, natural gas prices, and foreign currency exchange rates. The aluminum and natural gas financial contracts qualify for cash flow hedge accounting. The foreign exchange financial contracts do not qualify for hedge accounting treatment. These contracts are held by a separate wholly-owned subsidiary of Alcoa Corporation and are intended to limit the Company’s net cash outlays to the committed funding under the San Ciprián joint venture agreement. The associated realized gains or losses have no impact on the results of the San Ciprián operations.

Alcoa Corporation’s aluminum, foreign exchange and natural gas contracts are classified as Level 1 under the fair value hierarchy. All of the Level 1 contracts are designated as either fair value or cash flow hedging instruments (except as described above). Alcoa Corporation also has several derivative instruments classified as Level 3 under the fair value hierarchy, which are either designated as cash flow hedges or undesignated. Alcoa included the changes in its equity method investee’s Level 2 derivatives in Accumulated other comprehensive loss through June 30, 2024, when the underlying contracts expired.

The following tables present the detail for Level 1 and 3 derivatives (see additional Level 3 information in further tables below):

	March 31, 2025				December 31, 2024
	Assets		Liabilities		Assets		Liabilities
Level 1 derivative instruments	$	19	$	12	$	1	$	20
Level 3 derivative instruments		30		1,096		24		1,079
Total	$	49	$	1,108	$	25	$	1,099
Less: Current		38		258		25		263
Noncurrent	$	11	$	850	$	—	$	836

	2025						2024
First quarter ended March 31,	Unrealized gain (loss) recognized in Other comprehensive income (loss)			Realized loss reclassified from Accumulated other comprehensive loss to earnings			Unrealized (loss) gain recognized in Other comprehensive income (loss)			Realized gain (loss) reclassified from Accumulated other comprehensive loss to earnings
Level 1 derivative instruments	$	24		$	(2	)	$	(3	)	$	4
Level 3 derivative instruments		(109	)		(93	)		120			(57	)
Total	$	(85	)	$	(95	)	$	117		$	(53	)

For the first quarters of 2025 and 2024, the realized loss of $2 and realized gain of $4, respectively, on Level 1 cash flow hedges were recognized in Sales.

The following table presents the outstanding quantities of derivative instruments classified as Level 1:

	Classification	March 31, 2025		March 31, 2024
Aluminum (in kmt)	Commodity buy forwards		173		101
Aluminum (in kmt)	Commodity sell forwards		458		44
Foreign currency (in millions of euro)	Foreign exchange buy forwards		163		79
Foreign currency (in millions of euro)	Foreign exchange sell forwards		11		17
Foreign currency (in millions of euro) (undesignated)	Foreign exchange buy forwards		852		—
Foreign currency (in millions of Norwegian krone)	Foreign exchange buy forwards		20		102
Foreign currency (in millions of Brazilian real)	Foreign exchange buy forwards		160		450
Foreign currency (in millions of Australian dollars)	Foreign exchange buy forwards		41		—
Foreign currency (in millions of Canadian dollar)	Foreign exchange buy forwards		—		26
Natural gas (in millions of megawatt hours)	Commodity buy forwards		2		—

Alcoa Corporation routinely uses Level 1 aluminum derivative instruments to manage exposures to changes in the fair value of firm commitments for the purchases or sales of aluminum. Additionally, Alcoa uses aluminum derivative instruments to manage LME exposures related to profitability improvement actions (expires December 2025) and the San Ciprián smelter (see above) (expires December 2027).

17

Alcoa Corporation uses Level 1 foreign exchange forward contracts to mitigate the risk of foreign exchange exposure related to euro power purchases in Norway (expires March 2028), U.S. dollar aluminum sales in Norway (expires June 2025), U.S. dollar alumina and aluminum sales in Brazil (expires October 2026), U.S. dollar alumina sales in Australia (expires December 2026) and euro expenses (primarily energy and labor) (expires December 2027). Additionally, Alcoa used Level 1 foreign exchange forward contracts to mitigate the risk of foreign exchange exposure related to Canadian dollar expenses in Canada (expired March 2025).

Alcoa Corporation uses Level 1 natural gas derivative instruments to mitigate the risk of price fluctuations on natural gas purchases in Spain (expires December 2027).

Additional Level 3 Disclosures

The following table presents quantitative information related to the significant unobservable inputs described above for Level 3 derivative instruments (megawatt hours in MWh):

	March 31, 2025		Unobservable Input	Unobservable Input Range
Asset Derivatives
Financial contract (undesignated)	$	30	Interrelationship of forward energy price, LME forward price and the Consumer Price Index	Electricity (per MWh)	2025: $31.92 2025: $60.48
				LME (per mt)	2025: $2,516
					2025: $2,547
Power contract		—	MWh of energy needed to produce the forecasted mt of aluminum	LME (per mt)	2025: $2,516 2025: $2,530
				Midwest premium (per pound)	2025: $0.5200 2025: $0.5200
				Electricity	Rate of 2 million MWh per year
Total Asset Derivatives	$	30
Liability Derivatives
Power contract	$	135	MWh of energy needed to produce the forecasted mt of aluminum	LME (per mt)	2025: $2,516 2027: $2,624
				Electricity	Rate of 4 million MWh per year
Power contracts		958	MWh of energy needed to produce the forecasted mt of aluminum	LME (per mt)	2025: $2,516 2029: $2,701 2036: $2,888
				Midwest premium (per pound)	2025: $0.5200 2029: $0.5200 2036: $0.5200
				Electricity	Rate of 18 million MWh per year
Power contract (undesignated)		3	Estimated spread between the 30-year debt yield of Alcoa and the counterparty	Credit spread	1.35%: 30-year debt yield spread 6.70%: Alcoa (estimated) 5.35%: counterparty
Total Liability Derivatives	$	1,096

The fair values of Level 3 derivative instruments recorded in the accompanying Consolidated Balance Sheet were as follows:

Asset Derivatives	March 31, 2025		December 31, 2024
Derivatives not designated as hedging instruments:
Current—financial contract	$	30	$	24
Total derivatives not designated as hedging instruments	$	30	$	24
Total Asset Derivatives	$	30	$	24
Liability Derivatives
Derivatives designated as hedging instruments:
Current—power contracts	$	249	$	251
Noncurrent—power contracts		844		826
Total derivatives designated as hedging instruments	$	1,093	$	1,077
Derivatives not designated as hedging instruments:
Current—embedded credit derivative	$	1	$	1
Noncurrent—embedded credit derivative		2		1
Total derivatives not designated as hedging instruments	$	3	$	2
Total Liability Derivatives	$	1,096	$	1,079

Assuming market rates remain constant with the rates at March 31, 2025, a realized loss of $249 related to power contracts is expected to be recognized in Sales over the next 12 months.

18

At March 31, 2025 and December 31, 2024, the power contracts with embedded derivatives designated as cash flow hedges include hedges of forecasted aluminum sales of 1,175 kmt and 1,230 kmt, respectively.

The following tables present the reconciliation of activity for Level 3 derivative instruments:

	Assets
First quarter ended March 31, 2025	Financial contracts
January 1, 2025	$	24
Total gains or losses included in:
Other income, net (unrealized/realized)		8
Settlements and other		(2	)
March 31, 2025	$	30
Change in unrealized gains or losses included in earnings    for derivative instruments held at March 31, 2025:
Other income, net	$	8

	Liabilities
First quarter ended March 31, 2025	Power contracts			Embedded credit derivative
January 1, 2025	$	1,077		$	2
Total gains or losses included in:
Sales (realized)		(93	)		—
Other expenses, net (unrealized/realized)		—			1
Other comprehensive loss (unrealized)		109			—
March 31, 2025	$	1,093		$	3
Change in unrealized gains or losses included in earnings    for derivative instruments held at March 31, 2025:
Other expenses, net	$	—		$	1

There were no purchases, sales, or settlements of Level 3 derivative instruments in the periods presented.

Other Financial Instruments

The carrying values and fair values of Alcoa Corporation’s other financial instruments were as follows:

	March 31, 2025				December 31, 2024
	Carrying value		Fair value		Carrying value		Fair value
Cash and cash equivalents	$	1,202	$	1,202	$	1,138	$	1,138
Restricted cash		88		88		96		96
Short-term borrowings		45		45		50		50
Long-term debt due within one year		75		75		75		75
Long-term debt, less amount due within one year		2,573		2,594		2,470		2,499

The following methods were used to estimate the fair values of other financial instruments:

Cash and cash equivalents and Restricted cash. The carrying amounts approximate fair value because of the short maturity of the instruments. The fair value amounts for Cash and cash equivalents and Restricted cash were classified in Level 1 of the fair value hierarchy.

Short-term borrowings and Long-term debt, including amounts due within one year. The fair value of Long-term debt, less amounts due within one year was based on quoted market prices for public debt and on interest rates that are currently available to Alcoa Corporation for issuance of debt with similar terms and maturities for non-public debt. The fair value amounts for all Short-term borrowings and Long-term debt were classified in Level 2 of the fair value hierarchy.

19

N. Income Taxes – Alcoa Corporation’s estimated annualized effective tax rate (AETR) for 2025 as of March 31, 2025 differs from the U.S. federal statutory rate of 21% primarily due to income in certain jurisdictions with full valuation allowances resulting in no incremental tax expense. In addition, income in foreign jurisdictions with higher statutory tax rates contribute to the variance from 21%.

	First quarter ended March 31,
	2025				2024
Income (loss) before income taxes	$	668			$	(325	)
Estimated annualized effective tax rate		19.3		%		(8.9	)	%
Income tax expense	$	129			$	29
Favorable tax impact related to losses in jurisdictions with no tax benefit		(11	)			(47	)
Discrete tax expense		2				—
Provision for (benefit from) income taxes	$	120			$	(18	)

The Inflation Reduction Act of 2022 (IRA) contains a number of tax credits and other incentives for investments in renewable energy production, carbon capture, and other climate-related actions, as well as the production of critical minerals. In December 2023, the U.S. Treasury issued guidance on Section 45X of the Advanced Manufacturing Tax Credit. The Notice of Proposed Rulemaking (the Proposed Regulations) clarified that commercial grade aluminum is included in the definition of aluminum eligible for the credit, which was designed to incentivize domestic production of critical materials important for the transition to clean energy.

On October 24, 2024, the U.S. Treasury finalized the Proposed Regulations under Section 45X with important modifications including the ability to include the cost of certain direct and indirect materials in the cost base of the credit. The Proposed Regulation on the definition of aluminum was not finalized; however, management believes that commercial grade aluminum continues to qualify for the Section 45X credit. In the Preamble to the Final Regulations, the U.S. Treasury indicated it will finalize the definition at a later date.

In the first quarters of 2025 and 2024, the Company recorded benefits of $14 and $9 in Cost of goods sold, respectively, related to its Massena West smelter (New York) and its Warrick smelter (Indiana). As of March 31, 2025, benefits of $36 were included in Other receivables and $85 were included in Other noncurrent assets on the Consolidated Balance Sheet. As of December 31, 2024, benefits of $36 were included in Other receivables and $71 were included in Other noncurrent assets on the Consolidated Balance Sheet.

ANHBV has a full valuation allowance recorded against deferred tax assets, which was established in 2016, as the Company believes it is more likely than not that these tax benefits will not be realized. The majority of ANHBV’s net deferred tax assets relate to prior net operating losses and interest expense; the loss carryforwards are not subject to an expiration period. If ANHBV continues to demonstrate sustained profitability, management may conclude that ANHBV’s deferred tax assets may be realized, resulting in a future reversal of the valuation allowance, generating a non-cash benefit in the period recorded. ANHBV’s net deferred tax assets, excluding the valuation allowance, were $248 as of March 31, 2025.

Alcoa World Alumina Brasil Ltda. (AWAB) has a full valuation allowance recorded against deferred tax assets, which was established in 2023, as the Company believes it is more likely than not that these tax benefits will not be realized. The majority of AWAB’s net deferred tax assets relate to prior net operating losses; the loss carryforwards are not subject to an expiration period. If AWAB continues to demonstrate sustained profitability, management may conclude that AWAB’s deferred tax assets may be realized, resulting in a future reversal of the valuation allowance, generating a non-cash benefit in the period recorded. AWAB’s net deferred tax assets, excluding the valuation allowance, were $109 as of March 31, 2025.

20

O. Contingencies

Environmental Matters

Alcoa Corporation participates in environmental assessments and cleanups at several locations. These include currently or previously owned or operated facilities and adjoining properties, and waste sites, including Superfund (Comprehensive Environmental Response, Compensation and Liability Act (CERCLA)) sites.

Alcoa Corporation’s environmental remediation reserve balance reflects the most probable costs to remediate identified environmental conditions for which costs can be reasonably estimated. The following table details the changes in the carrying value of recorded environmental remediation reserves:

Balance at December 31, 2023	$	268
Liabilities incurred		25
Cash payments		(49	)
Reversals of previously recorded liabilities		(12	)
Foreign currency translation and other		(12	)
Balance at December 31, 2024		220
Cash payments		(8	)
Foreign currency translation and other		1
Balance at March 31, 2025	$	213

At March 31, 2025 and December 31, 2024, the current portion of the environmental remediation reserve balance was $44 and $38, respectively.

Payments related to remediation expenses applied against the reserve were $8 and $6 in the first quarters of 2025 and 2024, respectively. These amounts include mandated expenditures as well as those not required by any regulatory authority or third party.

The estimated timing of cash outflows from the environmental remediation reserve at March 31, 2025 was as follows:

2025 (excluding the three months ended March 31, 2025)	$	35
2026 – 2030		83
Thereafter		95
Total	$	213

Reserve balances at March 31, 2025 and December 31, 2024, associated with significant sites with active remediation underway or for future remediation were $151 and $154, respectively. In management’s judgment, the Company’s reserves are sufficient to satisfy the provisions of the respective action plans. Upon changes in facts or circumstances, a change to the reserve may be required. The Company’s significant sites include:

Suriname—The reserve associated with the 2017 closure of the Suralco refinery and bauxite mine is for treatment and disposal of refinery waste and soil remediation. The work began in 2017 and is expected to be completed at the end of 2029.

Hurricane Creek, Arkansas—The reserve associated with the 1990 closure of two mining areas and refineries near Hurricane Creek, Arkansas is for ongoing monitoring and maintenance for water quality surrounding the mine areas and residue disposal areas.

Massena, New York—The reserve associated with the 2015 closure of the Massena East smelter by the Company’s subsidiary, Reynolds Metals Company, is for subsurface soil remediation to be performed after demolition of the structures. Remediation work commenced in 2021 and will take up to eight years to complete.

Point Comfort, Texas—The reserve associated with the 2019 closure of the Point Comfort alumina refinery is for disposal of industrial wastes contained at the site, subsurface remediation, and post-closure monitoring and maintenance. The final remediation plan is currently being developed, which may result in a change to the existing reserve.

Addy, Washington—The reserve associated with the 2022 closure of the Addy magnesium smelter facility is for site-wide remediation and investigation and post-closure monitoring and maintenance. Remediation work is not expected to begin until 2027 and will take three to five years to complete. The final remediation plan is currently being developed, which may result in a change to the existing reserve.

Ferndale, Washington—The reserve associated with the 2023 closure of the Intalco aluminum smelter in Ferndale, Washington is for below grade site remediation and five years of post-closure maintenance and monitoring. The final remediation plan is under review.

21

Other Sites—The Company is in the process of decommissioning various other plants and remediating sites in several countries for potential redevelopment or to return the land to a natural state. In aggregate, there are remediation projects at 31 other sites that are planned or underway. These activities will be completed at various times in the future over the next two to four years, after which ongoing monitoring and other activities may be required. At March 31, 2025 and December 31, 2024, the reserve balance associated with these activities was $62 and $66, respectively.

Tax

Brazil (AWAB)—Under Brazilian law, taxpayers who generate non-cumulative federal value added tax credits related to exempt exports may either request a refund in cash (monetization) or offset them against other federal taxes owed. In 2012, AWAB requested monetization of $136 (R$273) from the Brazilian Federal Revenue Office (RFB) and received $68 (R$136) that year. In March 2013, AWAB was notified by the RFB that approximately $110 (R$220) of value added tax credits previously claimed were being disallowed and a penalty of 50% was assessed. $41 (R$82) of the cash received in 2012 related to the disallowed amount. The value added tax credits were claimed by AWAB for both fixed assets and export sales related to the Juruti bauxite mine and Alumar refinery expansion for tax years 2009 through 2011. The RFB has disallowed credits they allege belong to the consortium in which AWAB owns an interest and should not have been claimed by AWAB. Credits have also been disallowed as a result of challenges to apportionment methods used, questions about the use of the credits, and an alleged lack of documented proof. AWAB presented defense of its claim to the RFB on April 8, 2013.

In February 2022, the RFB notified AWAB that it had inspected the value added tax credits claimed for 2012 and disallowed $4 (R$19). In its decision, the RFB allowed credits of $14 (R$65) that were similar to those previously disallowed for 2009 through 2011. In July 2022, the RFB notified AWAB that it had inspected the value added tax credits claimed for 2013 and disallowed $13 (R$66). In its decision, the RFB allowed credits of $10 (R$53) that were similar to those previously disallowed for 2009 through 2011. In September 2024, the RFB notified AWAB that it had further inspected the value added tax credits claimed for 2013 and issued a first administrative decision allowing additional credits of $1 (R$5) that were similar to those previously disallowed for 2009 through 2011. AWAB received the 2012 allowed credits with interest of $9 (R$44) in March 2022, the 2013 allowed credits with interest of $6 (R$31) in August 2022, and the additional 2013 allowed credits with interest of $1 (R$6) in December 2024. The decisions on the 2012 and 2013 credits provide positive evidence to support management’s opinion that there is no basis for these credits to be disallowed. AWAB will continue to dispute the credits that were disallowed for 2012 and 2013. If AWAB is successful in this administrative process, the RFB would have no further recourse. If unsuccessful in this process, AWAB has the option to litigate at a judicial level. Separately from AWAB’s administrative appeal, in June 2015, a new tax law was enacted repealing the provisions in the tax code that were the basis for the RFB assessing a 50% penalty in this matter. As such, the estimated range of reasonably possible loss for these matters is $0 to $52 (R$300). It is management’s opinion that the allegations have no basis; however, at this time, the Company is unable to reasonably predict an outcome for this matter.

Australia (AofA)—On April 30, 2025, the Administrative Review Tribunal of Australia (ART) issued its decision related to the proceedings Alcoa of Australia Limited (AofA) filed against the Australian Taxation Office (ATO) in April 2022 to contest the Notices of Assessment (the Notices) issued by the ATO in July 2020 (described below) related to transfer pricing of certain historic third-party alumina sales. The ART decided that no additional tax is owed, consistent with Alcoa’s long-held position related to this matter.

The Notices asserted claims for income tax payable by AofA of approximately $135 (A$214) and claims for compounded interest on the tax amount totaling approximately $445 (A$707). In addition to the Notices, the ATO issued a position paper in September 2020 with its preliminary view on the imposition of administrative penalties related to the tax assessment which proposed penalties of approximately $81 (A$128). During 2020, AofA lodged formal objections to the Notices, provided a submission on the ATO’s imposition of interest, and submitted a response to the ATO’s position paper on penalties. AofA has not received a response to its submission on the ATO’s imposition of interest or its response to the ATO’s position paper on penalties.

In accordance with the ATO’s dispute resolution practices, AofA paid 50% of the assessed income tax amount exclusive of interest and any penalties, or approximately $74 (A$107), during the third quarter 2020. AofA funded the payment with cash on hand and recorded the payment within Other noncurrent assets as a noncurrent prepaid tax asset; at March 31, 2025, the related balance was $67 (A$107).

Interest on the unpaid tax was accrued through March 31, 2025, which, along with the initial interest assessment, was deductible against taxable income by AofA. Beginning in the third quarter of 2020, AofA applied this deduction and total reductions in cash tax payments of $216 (A$343) and $206 (A$332) were reflected within Other noncurrent liabilities and deferred credits as a noncurrent accrued tax liability at March 31, 2025 and December 31, 2024, respectively.

22

The ATO has 28 days to appeal the ART’s decision. Should the ATO choose not to appeal, the disputed tax claims (and additional related interest and penalties) will be withdrawn. With a withdrawal of the ATO’s claims, the prepaid tax asset of $67 (A$107) would be expected to be refunded to AofA in June 2025, and accrued cash taxes of $216 (A$343) related to the interest deductions would be payable by AofA by June 1, 2026. The net cash impact of both the refunded amount and the accrued cash taxes would be approximately $149 (A$236) through June 2026.

The Company maintains that the sales that were subject to the ATO’s review, which were ultimately sold to Aluminium Bahrain B.S.C., were the result of arm’s length transactions by AofA over two decades and were made at arm’s length prices consistent with the prices paid by other third-party alumina customers. The Company continues to believe it is more likely than not that AofA’s tax position will be sustained in the event of an appeal by the ATO.

References to any assessed U.S. dollar amounts presented in connection with this matter have been converted into U.S. dollars from Australian dollars based on the exchange rate in the respective period.

General

In addition to the matters discussed above, various other lawsuits, claims, and proceedings have been or may be instituted or asserted against Alcoa Corporation, including those pertaining to environmental, safety and health, commercial, tax, product liability, intellectual property infringement, governance, employment, and employee and retiree benefit matters, and other actions and claims arising out of the normal course of business. While the amounts claimed in these other matters may be substantial, the ultimate liability is not readily determinable because of the considerable uncertainties that exist. Accordingly, it is possible that the Company’s liquidity or results of operations in a particular period could be materially affected by one or more of these other matters. However, based on facts currently available, management believes that the disposition of these other matters that are pending or asserted will not have a material adverse effect, individually or in the aggregate, on the financial position of the Company.

P. Other Financial Information

Other (Income) Expenses, Net

	First quarter ended March 31,
	2025			2024
Equity loss	$	6		$	27
Foreign currency (gains) losses, net		(17	)		24
Net loss from asset sales		3			11
Net (gain) loss on mark-to-market derivative instruments		(7	)		5
Non-service costs – pension and other postretirement benefits		6			4
Other, net		(17	)		(12	)
	$	(26	)	$	59

Other Noncurrent Assets

	March 31, 2025		December 31, 2024
Prepaid gas transmission contract	$	285	$	278
Gas supply prepayment		220		225
Value added tax credits		211		213
Deferred mining costs, net		196		184
Goodwill		143		142
Prepaid pension benefit		131		128
IRA Section 45X credit		85		71
Noncurrent restricted cash		68		53
Noncurrent prepaid tax asset		67		66
Intangibles, net		35		36
Other		101		101
	$	1,542	$	1,497

23

Cash and Cash Equivalents and Restricted Cash

	March 31, 2025		December 31, 2024
Cash and cash equivalents	$	1,202	$	1,138
Current restricted cash		20		43
Noncurrent restricted cash		68		53
	$	1,290	$	1,234

Restricted cash primarily relates to commitments included in the viability agreement reached with the workers’ representatives of the San Ciprián smelter in December 2021, and subsequently updated in February 2023. $11 was released from restricted cash in the first quarter of 2025, related to smelter restart and capital expenditures incurred in the fourth quarter of 2024 and first quarter of 2025. At March 31, 2025, the Company had restricted cash of $75 available for capital improvements at the site and smelter restart costs.

Q. Supplier Finance Programs

The Company has various supplier finance programs with third-party financial institutions that are made available to suppliers to facilitate payment term negotiations. Under the terms of these agreements, participating suppliers receive payment in advance of the payment date from third-party financial institutions for qualifying invoices. Alcoa’s obligations to its suppliers, including amounts due and payment terms, are not impacted by its suppliers’ participation in these programs. The Company does not pledge any assets as security or provide any guarantees beyond payment of outstanding invoices at maturity under these arrangements. The Company does not pay fees to the financial institutions under these arrangements. At March 31, 2025 and December 31, 2024, qualifying supplier invoices outstanding under these programs were $97 and $94, respectively, and have payment terms ranging from 50 to 110 days. These obligations are included in Accounts payable, trade on the accompanying Consolidated Balance Sheet.

R. Subsequent Events

On April 28, 2025, Alcoa’s San Ciprián complex was impacted by the widespread power outage across Spain. As a result of the outage, both the refinery and smelter at the complex were affected. Due to the preliminary nature of the information, Alcoa is unable to reasonably estimate the impact to the Company’s results of operations until a thorough assessment is complete.

24

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

(dollars in millions, except per-share amounts, average realized prices, and average cost amounts; metric tons in thousands (kmt); dry metric tons in millions (mdmt))

Business Update

During the first quarter of 2025, Alcoa continued to execute its key operational and capital allocation objectives, including the formation of the joint venture in Spain with IGNIS Equity Holdings, SL (IGNIS EQT) and repositioning debt in Australia closer to its operating assets, which require considerable capital expenditures to complete mine moves over the next several years. Additionally, the Alumina segment and the Aluminum segment experienced operational stability and strong production results, while the Alumar (Brazil) smelter increased operating capacity to approximately 90% as of March 31, 2025.

During the quarter, the United States government imposed a 25% tariff on certain aluminum imports from Canada under Section 232 of the Trade Expansion Act of 1962 (Section 232), which became effective on March 12, 2025. The Section 232 tariff was previously 10%, and Canadian metal imported into the U.S. was exempted. Approximately 70% of the aluminum Alcoa produces in Canada is shipped to U.S. customers. Throughout the first quarter 2025, Alcoa actively engaged with administrations, governments, and policy makers in the U.S. and globally regarding the impact of tariffs on trade flows and the importance of primary aluminum to the U.S. economy through the deeply integrated aluminum supply chain. Additionally, the Company engaged with customers, suppliers, and logistics companies to avoid supply disruptions.

Portfolio Actions

San Ciprián Operations

On March 31, 2025, Alcoa and IGNIS EQT entered into a joint venture agreement whereby Alcoa owns 75% and continues as the managing operator and IGNIS EQT owns 25% of the San Ciprián operations.

Alcoa and IGNIS EQT contributed $81 (€75) and $27 (€25), respectively, to form the joint venture. Additionally, up to approximately $108 (€100) may be funded by Alcoa as needed for operations with a priority position in future cash returns. Further funding requires agreement by both partners and would be shared 75% by Alcoa and 25% by IGNIS EQT.

The transaction was accounted for as an equity transaction where IGNIS EQT’s noncontrolling interest was reflected as a decrease to Additional capital on the accompanying Consolidated Balance Sheet. Under the terms of the joint venture agreement, IGNIS EQT has a put option whereby IGNIS EQT can require Alcoa Corporation to purchase from IGNIS EQT its 25% interest at the then fair market value upon certain change in control provisions. Alcoa classified the Noncontrolling interest within Mezzanine equity on the Consolidated Balance Sheet, as IGNIS EQT’s redemption is not solely within the Company’s control. Alcoa will recognize earnings attributable to IGNIS EQT’s ownership interest within Noncontrolling interest beginning in the second quarter of 2025.

Debt Repositioning

In March 2025, Alumina Pty Ltd, a wholly-owned subsidiary of Alcoa Corporation, completed Rule 144A (U.S. Securities Act of 1933, as amended) debt issuances of $500 aggregate principal amount of 6.125% Senior Notes due 2030 (the 2030 Notes) and $500 aggregate principal amount of 6.375% Senior Notes due 2032 (the 2032 Notes, and, collectively with the 2030 Notes, the Notes). The net proceeds of these issuances were $985, reflecting a discount to the initial purchasers of the Notes as well as issuance costs. The Company utilized certain proceeds of these transactions to fund contributions to Alcoa Nederland Holding B.V. (ANHBV), a wholly-owned subsidiary of Alcoa Corporation and the issuer of the outstanding $750 aggregate principal amount of 5.500% Notes due 2027 (the Existing 2027 Notes) and $500 aggregate principal amount of 6.125% Notes due 2028 (the Existing 2028 Notes). These contributions were funded through a series of intercompany transactions, including the repayment of intercompany indebtedness and the issuance of intercompany dividends. ANHBV used such funds, along with cash on hand, to fund the purchase price pursuant to the cash tender offers announced and settled in March 2025, including premiums and transaction costs. The net proceeds also support Alcoa’s general corporate purposes.

In March 2025, ANHBV announced and settled cash tender offers which resulted in the tender and acceptance of $609 of the $750 aggregate principal amount of Existing 2027 Notes and $281 of the $500 aggregate principal amount of Existing 2028 Notes for purchase. The issuance of the 2030 Notes and 2032 Notes and the cash tender of the Existing 2027 Notes and Existing 2028 Notes were determined to be issuances of new debt and extinguishments of existing debt. As a result, the Company incurred $12 of debt settlement expenses in the first quarter of 2025 in Interest expense, which was comprised of the settlement premiums, transaction costs, and the write-off of unamortized discounts and deferred financing costs.

Other Matters

On April 28, 2025, Alcoa’s San Ciprián complex was impacted by the widespread power outage across Spain. As a result of the outage, both the refinery and smelter at the complex were affected. Due to the preliminary nature of the information, Alcoa is unable to reasonably estimate the impact to the Company’s results of operations until a thorough assessment is complete.

See the below sections for additional details on the above-described actions.

25

Results of Operations

The discussion that follows includes a comparison of our results of operations and liquidity and capital resources for the quarterly and year-to-date periods outlined in the table below.

Selected Financial Data:

	Quarter ended					Three months ended
	Sequential					Year-to-date
Statement of Operations	March 31, 2025			December 31, 2024		March 31, 2025			March 31, 2024
Sales	$	3,369		$	3,486	$	3,369		$	2,599
Cost of goods sold (exclusive of expenses below)		2,438			2,714		2,438			2,404
Selling, general administrative, and other expenses		71			80		71			60
Research and development expenses		12			17		12			11
Provision for depreciation, depletion, and amortization		148			159		148			161
Restructuring and other charges, net		5			91		5			202
Interest expense		53			45		53			27
Other (income) expenses, net		(26	)		42		(26	)		59
Total costs and expenses		2,701			3,148		2,701			2,924
Income (loss) before income taxes		668			338		668			(325	)
Provision for (benefit from) income taxes		120			136		120			(18	)
Net income (loss)		548			202		548			(307	)
Less: Net loss attributable to noncontrolling interest		—			—		—			(55	)
Net income (loss) attributable to Alcoa Corporation	$	548		$	202	$	548		$	(252	)

	Quarter ended				Three months ended
Selected Financial Metrics	March 31, 2025		December 31, 2024		March 31, 2025		March 31, 2024
Diluted income (loss) per share attributable to Alcoa    Corporation common shareholders	$	2.07	$	0.76	$	2.07	$	(1.41	)
Third-party shipments of alumina (kmt)		2,105		2,289		2,105		2,397
Third-party shipments of aluminum (kmt)		609		641		609		634
Average realized price per metric ton of alumina	$	575	$	636	$	575	$	372
Average realized price per metric ton of aluminum	$	3,213	$	3,006	$	3,213	$	2,620
Average Alumina Price Index (API)(1)	$	612	$	641	$	612	$	356
Average London Metal Exchange (LME) 15-day lag(2)	$	2,607	$	2,577	$	2,607	$	2,201

(1)API (Alumina Price Index) is a pricing mechanism that is calculated by the Company based on the weighted average of a prior month’s daily spot prices published by the following three indices: CRU Metallurgical Grade Alumina Price; Platts Metals Daily Alumina PAX Price; and FastMarkets Metal Bulletin Non-Ferrous Metals Alumina Index.

(2)LME (London Metal Exchange) is a globally recognized exchange for commodity trading, including aluminum. The LME pricing component represents the underlying base metal component, based on quoted prices for aluminum on the exchange.

26

Overview

Sequential period comparison

Net income (loss) attributable to Alcoa Corporation was $548 in the first quarter of 2025 compared with $202 in the fourth quarter of 2024. The favorable change of $346 is primarily a result of:

•Lower intersegment profit elimination

•Higher average realized price of aluminum

•Lower restructuring charges

•Favorable currency revaluation impacts

•Higher volumes and price from bauxite offtake and supply agreements

Partially offset by:

•Higher average alumina input costs in the Aluminum segment

•Lower shipments of alumina and aluminum

•Tariffs on imports of aluminum from Canada

Year-to-date comparison

Net income (loss) attributable to Alcoa Corporation was $548 in the first quarter of 2025 compared with $(252) in the first quarter of 2024. The favorable change of $800 is primarily a result of:

•Higher average realized price of alumina and aluminum

•Lower restructuring charges

•Lower intersegment profit elimination

•Favorable currency impacts

•Absence of Net loss attributable to noncontrolling interest

Partially offset by:

•Higher average alumina input costs in the Aluminum segment

•Higher taxes on higher earnings

Sales

Sequential period comparison

Sales decreased $117 primarily as a result of:

•Lower shipments of alumina and aluminum

•Lower average realized price of alumina

•Unfavorable currency impacts

Partially offset by:

•Higher volumes and price from bauxite offtake and supply agreements

•Higher average realized price of aluminum

Year-to-date comparison

Sales increased $770 primarily as a result of:

•Higher average realized price of alumina and aluminum

•Higher volumes and price from bauxite offtake and supply agreements

Partially offset by:

•Lower shipments of alumina and aluminum

27

Cost of goods sold

Sequential period comparison

Cost of goods sold as a percentage of sales decreased 5% primarily as a result of:

•Lower intersegment profit elimination

•Higher average realized price of aluminum

Partially offset by:

•Higher average alumina input costs in the Aluminum segment

•Lower average realized price of alumina

Year-to-date comparison

Cost of goods sold as a percentage of sales decreased 20% primarily as a result of:

•Higher average realized price of alumina and aluminum

•Lower intersegment profit elimination

•Lower production costs in the Aluminum segment

Partially offset by:

•Higher average alumina input costs in the Aluminum segment

Selling, general administrative, and other expenses

Sequential period comparison

Selling, general administrative, and other expenses decreased $9 primarily as a result of:

•Favorable currency revaluation impacts

•Decreased fees for professional services

•Lower information technology services

Partially offset by:

•Higher labor costs

Year-to-date comparison

Selling, general administrative, and other expenses increased $11 primarily as a result of:

•Higher labor costs

Provision for depreciation, depletion, and amortization

Sequential period comparison

The Provision for depreciation, depletion, and amortization decreased $11 primarily as a result of:

•Lower depreciation in Brazil and Australia for mine reclamation and bauxite residue storage asset retirement obligations

•Favorable currency impacts

Year-to-date comparison

The Provision for depreciation, depletion, and amortization decreased $13 primarily as a result of:

•Favorable currency impacts

•Lower depreciation expense related to a group of assets reaching the end of their depreciable lives

•Lower amortization of mine development costs

Interest expense

Sequential period comparison

Interest expense increased $8 primarily as a result of:

•Debt settlement expenses for the Existing 2027 Notes and Existing 2028 Notes extinguished in March 2025

Partially offset by:

•The absence of interest incurred on the Alumina Limited revolving credit facility through November 29, 2024 when Alcoa repaid outstanding amounts under the facility

Year-to-date comparison

Interest expense increased $26 primarily as a result of:

•Debt settlement expenses for the Existing 2027 Notes and Existing 2028 Notes extinguished in March 2025

•Interest incurred on the $750 7.125% Senior Notes issued in March 2024

28

Other (income) expenses, net

Sequential period comparison

Other (income) expenses, net was ($26) in the first quarter of 2025 compared with $42 in the fourth quarter of 2024. The favorable change of $68 was primarily a result of:

•Favorable currency revaluation impacts primarily due to absence of losses recognized in the fourth quarter of 2024 due to the U.S. dollar strengthening against the Brazilian real, partially offset by gains in the current quarter due to the U.S. dollar weakening against the Brazilian real

•Absence of costs related to site separation commitments associated with the Warrick Rolling Mill sale

•Decrease in equity losses from the Ma’aden aluminum joint venture primarily due to lower production costs

Partially offset by:

•Unfavorable mark-to-market results on derivative instruments due to lower power prices in the current quarter

•Decrease in equity income from the Ma’aden bauxite and alumina joint venture primarily due to lower alumina prices and higher production costs

•Higher ELYSIS capital contributions, increasing loss recognition

Year-to-date comparison

Other (income) expenses, net was ($26) in the first quarter of 2025 compared with $59 in the first quarter of 2024. The favorable change of $85 was primarily a result of:

•Favorable currency revaluation impacts primarily due to the absence of losses recognized in the prior year due to the U.S. dollar strengthening against the Brazilian real, partially offset by gains in the current year due to the U.S. dollar weakening against the Brazilian real

•Increase in equity income from the Ma’aden bauxite and alumina joint venture primarily due to higher alumina prices and lower production costs

•Favorable mark-to-market results on derivative instruments primarily due to higher power prices in the current year

•Absence of costs related to site separation commitments associated with the Warrick Rolling Mill sale

Partially offset by:

•Increase in equity losses from the Ma’aden aluminum joint venture primarily due to higher alumina input costs, partially offset by higher aluminum prices

Restructuring and other charges, net

Sequential period comparison

In the first quarter of 2025, Restructuring and other charges, net of $5 primarily related to:

•$3 for certain employee obligations related to the February 2023 updated viability agreement for the San Ciprián aluminum smelter

•$2 for take-or-pay contract costs at a previously closed site

In the fourth quarter of 2024, Restructuring and other charges, net of $91 primarily related to:

•$82 for increase in costs related to the curtailment of the Kwinana (Australia) refinery

•$6 for take-or-pay contract costs at a previously closed site

Year-to-date comparison

In the first quarter of 2025, Restructuring and other charges, net of $5 primarily related to:

•$3 for certain employee obligations related to the February 2023 updated viability agreement for the San Ciprián aluminum smelter

•$2 for take-or-pay contract costs at a previously closed site

In the first quarter of 2024, Restructuring and other charges, net of $202 primarily related to:

•$197 for the curtailment of the Kwinana refinery

29

Provision for (benefit from) income taxes

Sequential period comparison

The Provision for income taxes in the first quarter of 2025 was $120 on income before taxes of $668 or 18%. In comparison, the fourth quarter of 2024 Provision for income taxes was $136 on income before taxes of $338 or 40.2%.

The decrease in tax expense of $16 is primarily due to the impact of the annualized effective tax rate when applied to current period earnings and decreased income in a jurisdiction where the Company maintains a full tax valuation allowance but is limited in net operating loss usage, partially offset by higher income in certain jurisdictions where taxes are paid.

Year-to-date comparison

The Provision for income taxes in the first quarter of 2025 was $120 on income before taxes of $668 or 18%. In comparison, the first quarter of 2024 Benefit from income taxes was $(18) on a loss before taxes of $(325) or 5.5%.

The increase in tax expense of $138 is primarily attributable to higher income in the jurisdictions where taxes are paid.

Noncontrolling interest

Noncontrolling interest previously related to Alumina Limited’s 40% ownership interest in the AWAC joint venture. Upon completion of the acquisition by Alcoa on August 1, 2024, Alumina Limited and, as a result, ownership in the AWAC joint venture, became wholly-owned by Alcoa Corporation.

On March 31, 2025, Alcoa and IGNIS EQT entered into a joint venture agreement. Alcoa owns 75% and continues as the managing operator and IGNIS EQT owns 25% of the San Ciprián operations. Alcoa will recognize earnings attributable to IGNIS EQT’s ownership interest within Noncontrolling interest beginning in the second quarter of 2025.

Sequential period comparison

Net income (loss) attributable to noncontrolling interest was $0 in the first quarter of 2025 and the fourth quarter of 2024.

Year-to-date comparison

Net income (loss) attributable to noncontrolling interest was $0 in the first quarter of 2025 compared with $(55) in the first quarter of 2024.

Net income (loss) attributable to noncontrolling interest of $(55) in the first quarter of 2024 reflects unfavorable restructuring costs and production costs, partially offset by favorable raw material and energy costs.

Segment Information

Alcoa Corporation is a producer of bauxite, alumina, and aluminum products. The Company has two operating and reportable segments: (i) Alumina and (ii) Aluminum. The primary measure of performance is Adjusted EBITDA (Earnings before interest, taxes, depreciation, and amortization) for each segment.

The Company calculates Segment Adjusted EBITDA as Total sales (third-party and intersegment) minus the following items: Cost of goods sold; Selling, general administrative, and other expenses; and Research and development expenses. Alcoa Corporation’s Segment Adjusted EBITDA may not be comparable to similarly titled measures of other companies. The Chief Operating Decision Maker regularly reviews Segment Adjusted EBITDA to assess performance and allocate resources.

30

Alumina

Business Update. The average API of $612 per metric ton decreased 5% compared to the fourth quarter of 2024, when API reached an all-time high driven primarily by supply disruptions. Compared to the first quarter of 2024, average API increased by 72%. The majority of third-party alumina sales are linked to the API and higher prices have resulted in strong results for the segment.

On March 31, 2025, Alcoa and IGNIS EQT entered into a joint venture agreement, which includes the San Ciprián refinery (see Portfolio actions above).

Capacity. The Alumina segment had a base capacity of 13,843 kmt with 3,204 kmt of curtailed refining capacity. There was no change in curtailed capacity during the quarter.

In the table below, total alumina shipments include metric tons that were not produced by the Alumina segment. Such alumina was purchased to satisfy certain customer commitments. The Alumina segment bears the risk of loss of the purchased alumina until control of the product has been transferred to this segment’s customers.

Adjusted operating costs include all production related costs for alumina produced and shipped: raw materials consumed; conversion costs, such as labor, materials, and utilities; and plant administrative expenses. Other segment items include costs associated with trading activity, the purchase of bauxite from offtake or other supply agreements, and commercial shipping services; other direct and non-production related charges; Selling, general administrative, and other expenses; and Research and development expenses.

	Quarter ended				Three months ended
	March 31, 2025		December 31, 2024		March 31, 2025		March 31, 2024
Bauxite production (mdmt)		9.5		9.3		9.5		10.1
Third-party bauxite shipments (mdmt)		3.0		2.4		3.0		1.0
Alumina production (kmt)		2,355		2,390		2,355		2,670
Third-party alumina shipments (kmt)		2,105		2,289		2,105		2,397
Intersegment alumina shipments (kmt)		1,093		1,199		1,093		943
Produced alumina shipments (kmt)		2,316		2,468		2,316		2,621
Third-party bauxite sales	$	243	$	128	$	243	$	64
Third-party alumina sales		1,220		1,467		1,220		897
Total segment third-party sales	$	1,463	$	1,595	$	1,463	$	961
Intersegment alumina sales		712		846		712		395
Total sales	$	2,175	$	2,441	$	2,175	$	1,356
Adjusted operating costs		723		766		723		796
Other segment items		788		959		788		421
Segment Adjusted EBITDA	$	664	$	716	$	664	$	139
Average realized third-party price per metric ton of alumina	$	575	$	636	$	575	$	372
Adjusted operating cost per metric ton of produced alumina shipped	$	312	$	310	$	312	$	304

Production

Sequential period comparison

Alumina production decreased 1% in comparison to the fourth quarter of 2024.

Year-to-date comparison

Alumina production decreased 12% primarily as a result of:

•Full curtailment of the Kwinana refinery in June 2024

31

Third-party sales

Sequential period comparison

Third-party sales decreased $132 primarily as a result of:

•Lower shipments of alumina primarily due to timing of shipments and decreased trading activity

•Unfavorable currency impacts

•Lower average realized price of $61/ton principally driven by a lower average API

Partially offset by:

•Higher volumes and price from bauxite offtake and supply agreements

Year-to-date comparison

Third-party sales increased $502 primarily as a result of:

•Higher average realized price of $203/ton principally driven by a higher average API

•Higher volumes and price from bauxite offtake and supply agreements

Partially offset by:

•Lower shipments of alumina primarily due to the full curtailment of the Kwinana refinery, timing of shipments, and decreased trading activity, partially offset by increased sales of externally sourced alumina to satisfy certain customer contracts

•Unfavorable currency impacts

Intersegment sales

Sequential period comparison

Intersegment sales decreased $134 primarily as a result of:

•Lower alumina shipments primarily due to timing of shipments

•Lower average API on sales to the Aluminum segment

Year-to-date comparison

Intersegment sales increased $317 primarily as a result of:

•Higher average API on sales to the Aluminum segment

•Higher alumina shipments primarily due to the Alumar smelter and Warrick (Indiana) smelter restarts

Segment Adjusted EBITDA

Sequential period comparison

Segment Adjusted EBITDA decreased $52 primarily as a result of:

•Lower average realized price

•Lower shipments

•Unfavorable currency impacts

Partially offset by:

•Higher volumes and price from bauxite offtake and supply agreements

•Lower production costs primarily related to the absence of a write down of certain inventories to their net realizable value

Year-to-date comparison

Segment Adjusted EBITDA increased $525 primarily as a result of:

•Higher average realized price

•Higher volumes and price from bauxite offtake and supply agreements

Partially offset by:

•Higher production costs primarily related to operating certain of the Australia refineries with lower grade bauxite, higher labor costs, and increased maintenance

Forward Look. For the second quarter of 2025 in comparison to the first quarter of 2025, the Alumina segment expects to maintain the strong operational performance delivered in the first quarter of 2025, with the benefit from higher shipments offsetting higher production costs.

Alcoa expects total 2025 Alumina segment production and shipments to remain unchanged from its prior projection, ranging between 9.5 to 9.7 million metric tons, and between 13.1 and 13.3 million metric tons, respectively. The difference between production and shipments reflects trading volumes and externally sourced alumina to fulfill customer contracts due to the curtailment of the Kwinana refinery.

32

Aluminum

Business Update. Aluminum prices increased sequentially with LME prices on a 15-day lag averaging $2,607 per metric ton in the first quarter of 2025. In the first quarter of 2025, the average Midwest premium (United States and Canada) increased by 57% sequentially following the introduction of 25% tariffs on aluminum imports from Canada, which became effective on March 12, 2025.

On March 31, 2025, Alcoa and IGNIS EQT entered into a joint venture agreement, which includes the San Ciprián smelter (see Portfolio actions above). The joint venture agreement allows for the planned restart of the San Ciprián smelter in 2025, a commitment included in the viability agreement reached with the workers’ representatives of the San Ciprián smelter in December 2021, and subsequently updated in February 2023. In connection with terms of the updated viability agreement, the Company has restricted cash of $75 remaining at March 31, 2025, to be made available for capital improvements at the site and smelter restart costs. In the first quarter of 2025, $11 was released from restricted cash related to smelter restart and capital expenditures incurred in the fourth quarter of 2024 and first quarter of 2025.

During the first quarter of 2025, the Company maintained the controlled pace for the restart of the Alumar smelter and continued actions to improve the smelter’s overall performance. The site was operating at approximately 90% of the site’s total annual capacity of 268 kmt (Alcoa share) as of March 31, 2025.

In the third quarter of 2024, Alcoa entered into a share purchase and subscription agreement with Ma’aden, pursuant to which Alcoa agreed to sell its full ownership interest of 25.1% in the Saudi Arabia joint venture to Ma’aden in exchange for issuance by Ma’aden of approximately 86 million shares and $150 in cash. In accordance with the announced transaction, the metal offtake agreement with Ma’aden was terminated in the first quarter of 2025.

In the table below, total aluminum third-party shipments include metric tons that were not produced by the Aluminum segment. Such aluminum was purchased by this segment to satisfy certain customer commitments. The Aluminum segment bears the risk of loss of the purchased aluminum until control of the product has been transferred to this segment’s customer. Additionally, Total shipments include offtake from a joint venture supply agreement.

The average realized third-party price per metric ton of aluminum includes three elements: a) the underlying base metal component, based on quoted prices from the LME; b) the regional premium, which represents the incremental price over the base LME component that is associated with the physical delivery of metal to a particular region (e.g., the Midwest premium for metal sold in the United States); and c) the product premium, which represents the incremental price for receiving physical metal in a particular shape (e.g., billet, slab, rod, etc.) or alloy.

Adjusted operating costs include all production related costs for aluminum produced and shipped: raw materials consumed; conversion costs, such as labor, materials, and utilities; and plant administrative expenses. Other segment items include costs associated with trading activity and energy assets; other direct and non-production related charges; Selling, general administrative, and other expenses; and Research and development expenses.

	Quarter ended						Three months ended
	March 31, 2025			December 31, 2024			March 31, 2025			March 31, 2024
Aluminum production (kmt)		564			571			564			542
Total aluminum shipments (kmt)		609			641			609			634
Produced aluminum shipments (kmt)		567			566			567			550
Third-party aluminum sales	$	1,955		$	1,928		$	1,955		$	1,661
Other(1)		(54	)		(33	)		(54	)		(23	)
Total segment third-party sales	$	1,901		$	1,895		$	1,901		$	1,638
Intersegment sales		4			4			4			4
Total sales	$	1,905		$	1,899		$	1,905		$	1,642
Adjusted operating costs		1,574			1,514			1,574			1,279
Other segment items		197			191			197			313
Segment Adjusted EBITDA	$	134		$	194		$	134		$	50
Average realized third-party price per metric ton of aluminum	$	3,213		$	3,006		$	3,213		$	2,620
Adjusted operating cost per metric ton of produced aluminum shipped	$	2,775		$	2,675		$	2,775		$	2,323

(1)Other includes third-party sales of energy, as well as realized gains and losses related to embedded derivative instruments designated as cash flow hedges of forward sales of aluminum.

33

Production

Sequential period comparison

Production decreased 1% primarily as a result of:

•Two fewer days in the period

Partially offset by:

•Alumar smelter restart

Year-to-date comparison

Production increased 4% primarily as a result of:

•Alumar smelter and Warrick smelter restarts

Third-party sales

Sequential period comparison

Third-party sales increased $6 primarily as a result of:

•Higher average realized price of $207/ton driven by a higher average LME (on a 15-day lag) and higher regional premiums, particularly the Midwest premium (United States and Canada) which rose by an average of 57%

Partially offset by:

•Lower shipments primarily due to the absence of volumes from a joint venture supply agreement and the timing of shipments

Year-to-date comparison

Third-party sales increased $263 primarily as a result of:

•Higher average realized price of $593/ton driven by a higher average LME (on a 15-day lag) and higher regional premiums, particularly the Midwest premium (United States and Canada) which rose by an average of 83%

Partially offset by:

•Lower shipments primarily due to the absence of volumes from a joint venture supply agreement

Segment Adjusted EBITDA

Sequential period comparison

Segment Adjusted EBITDA decreased $60 primarily as a result of:

•Unfavorable raw material costs primarily on higher average alumina input costs due to the consumption of alumina purchased in the previous periods when prices were higher

•Higher production costs primarily related to the absence of the full year 2023 and 2024 Inflation Reduction Act benefits recorded in the fourth quarter 2024

•Tariffs on imports from Canada, which was subjected to a 25% tariff under U.S. Section 232 effective March 12, 2025

•Lower shipments

Partially offset by:

•Higher average realized price

Year-to-date comparison

Segment Adjusted EBITDA increased $84 primarily as a result of:

•Higher average realized price

•Lower production costs primarily due to efficiencies at higher production rates

•Favorable currency impacts

Partially offset by:

•Unfavorable raw material costs primarily on higher average alumina input costs, partially offset by lower market prices for carbon materials

•Tariffs on imports from Canada, which was subjected to a 25% tariff under U.S. Section 232 effective March 12, 2025

34

The following table provides consolidated capacity and curtailed capacity (each in kmt) for each smelter owned by Alcoa Corporation:

		March 31, 2025				December 31, 2024				March 31, 2024
Facility	Country	Capacity(1)		Curtailed		Capacity(1)		Curtailed		Capacity(1)		Curtailed
Portland(2)	Australia		197		33		197		33		197		42
São Luís (Alumar)(3)	Brazil		268		27		268		42		268		84
Baie Comeau	Canada		324		—		324		—		324		—
Bécancour	Canada		350		—		350		—		350		—
Deschambault	Canada		287		—		287		—		287		—
Fjarðaál	Iceland		351		—		351		—		351		—
Lista	Norway		95		31		95		31		95		31
Mosjøen	Norway		200		—		200		—		200		—
San Ciprián	Spain		228		214		228		214		228		214
Massena West	U.S.		130		—		130		—		130		—
Warrick	U.S.		215		54		215		54		215		54
			2,645		359		2,645		374		2,645		425

(1)These figures represent Alcoa Corporation’s share of the facility Nameplate Capacity based on its ownership interest in the respective smelter.

(2)In the fourth quarter of 2024, the Company completed the restart of 16,000 metric tons per year (mtpy) of previously curtailed capacity at the Portland smelter in Australia that began in the fourth quarter of 2023.

(3)In 2021, the Company announced the restart of its 268,000 mtpy share of capacity at the Alumar smelter in São Luís, Brazil. Production began in the second quarter of 2022. Curtailed capacity decreased from March 31, 2024 as a result of the restart process.

Forward Look. For the second quarter of 2025 in comparison to the first quarter of 2025, the Aluminum segment expects increased costs associated with tariffs on imports of aluminum from Canada and the restart of the San Ciprián smelter.

Alcoa expects 2025 total Aluminum segment production and shipments to remain unchanged from its prior projection, ranging between 2.3 and 2.5 million metric tons, and between 2.6 and 2.8 million metric tons, respectively.

35

Reconciliations of Certain Segment Information

Reconciliation of Total Segment Third-Party Sales to Consolidated Sales

	Quarter ended					Three months ended
	March 31, 2025		December 31, 2024			March 31, 2025		March 31, 2024
Alumina	$	1,463	$	1,595		$	1,463	$	961
Aluminum		1,901		1,895			1,901		1,638
Total segment third-party sales	$	3,364	$	3,490		$	3,364	$	2,599
Other		5		(4	)		5		—
Consolidated sales	$	3,369	$	3,486		$	3,369	$	2,599

Reconciliation of Total Segment Adjusted EBITDA to Consolidated Net Income (Loss) Attributable to Alcoa Corporation

	Quarter ended						Three months ended
	March 31, 2025			December 31, 2024			March 31, 2025			March 31, 2024
Total Segment Adjusted EBITDA	$	798		$	910		$	798		$	189
Unallocated amounts:
Transformation(1)		(12	)		(18	)		(12	)		(14	)
Intersegment eliminations		103			(156	)		103			(8	)
Corporate expenses(2)		(37	)		(46	)		(37	)		(34	)
Provision for depreciation, depletion, and amortization		(148	)		(159	)		(148	)		(161	)
Restructuring and other charges, net		(5	)		(91	)		(5	)		(202	)
Interest expense		(53	)		(45	)		(53	)		(27	)
Other income (expenses), net		26			(42	)		26			(59	)
Other(3)		(4	)		(15	)		(4	)		(9	)
Consolidated income (loss) before income taxes		668			338			668			(325	)
(Provision for) benefit from income taxes		(120	)		(136	)		(120	)		18
Net loss attributable to noncontrolling interest		—			—			—			55
Consolidated net income (loss) attributable to Alcoa Corporation	$	548		$	202		$	548		$	(252	)

(1)Transformation includes, among other items, the Adjusted EBITDA of previously closed operations.

(2)Corporate expenses are composed of general administrative and other expenses of operating the corporate headquarters and other global administrative facilities, as well as research and development expenses of the corporate technical center.

(3)Other includes certain items that are not included in the Adjusted EBITDA of the reportable segments.

Environmental Matters

See the Environmental Matters section of Note O to the Consolidated Financial Statements in Part I Item 1 of this Form 10-Q.

36

Liquidity and Capital Resources

Management believes that the Company’s cash on hand, projected cash flows, and liquidity options, combined with its strategic actions, will be adequate to fund its short-term (at least 12 months) and long-term operating and investing needs. The Company plans to opportunistically access liquidity sources to support its cash position and ongoing cash needs. Further, the Company has flexibility related to its use of cash; the Company has debt maturities of $141 on the Existing 2027 Notes and $219 on the Existing 2028 Notes and no other significant debt maturities until 2029. Additionally, the Company has no significant cash contribution requirements related to its pension plan obligations.

Although management believes that Alcoa’s projected cash flows and other liquidity options will provide adequate resources to fund operating and investing needs, the Company’s access to, and the availability of, financing on acceptable terms in the future will be affected by many factors, including: (i) Alcoa Corporation’s credit rating; (ii) the liquidity of the overall capital markets; (iii) the current state of the economy and commodity markets, and (iv) short- and long-term debt ratings. There can be no assurances that the Company will continue to have access to capital markets on terms acceptable to Alcoa Corporation.

Changes in market conditions caused by U.S., global, or macroeconomic events, such as ongoing regional conflicts, high inflation, and changing U.S. or global monetary or trade policies could have adverse effects on Alcoa’s ability to obtain additional financing and cost of borrowing. Inability to generate sufficient earnings could impact the Company’s ability to meet the financial covenants in our outstanding debt and revolving credit facility agreements and limit our ability to access these sources of liquidity or refinance or renegotiate our outstanding debt or credit agreements on terms acceptable to the Company. Additionally, the impact on market conditions from such events could adversely affect the liquidity of Alcoa’s customers, suppliers, and joint venture partners and equity method investments, which could negatively impact the collectability of outstanding receivables and our cash flows.

Cash from Operations

Cash provided from operations was $75 in the three-month period of 2025 compared with cash used for operations of $223 in the same period of 2024. Notable changes to sources and (uses) of cash included:

•$658 favorable change in net income, excluding the impacts from restructuring charges, primarily due to higher alumina and aluminum pricing and lower intersegment profit elimination, partially offset by higher alumina input costs in the Aluminum segment; partially offset by,

•($207) in certain working capital accounts, primarily an increase in inventories in the three-month period of 2025 due to higher raw materials prices and volumes mainly in the Alumina segment and timing of aluminum shipments, a decrease in accounts payable in the three-month period of 2025 on lower alumina trading, partially offset by an increase in receivables in the three-month period of 2024 on less favorable payment terms due to a change in product mix and timing of shipments; and,

•($47) higher income taxes paid on higher current year earnings, in the jurisdictions where taxes are paid, as well as on prior year earnings.

On April 30, 2025, the Administrative Review Tribunal of Australia (ART) issued its decision related to the proceedings Alcoa of Australia Limited (AofA) filed against the Australian Taxation Office (ATO) in April 2022 to contest the Notices of Assessment issued by the ATO in July 2020 related to transfer pricing of certain historic third-party alumina sales. The ART decided that no additional tax is owed, consistent with Alcoa’s long-held position related to this matter. The ATO has 28 days to appeal the ART’s decision. Should the ATO choose not to appeal, the disputed tax claims (and additional related interest and penalties) will be withdrawn. With a withdrawal of the ATO’s claims, the prepaid tax asset of $67 (A$107) would be expected to be refunded to AofA in June 2025, and accrued cash taxes of $216 (A$343) related to the interest deductions would be payable by AofA by June 1, 2026. The net cash impact of both the refunded amount and the accrued cash taxes would be approximately $149 (A$236) through June 2026. See description of the tax dispute in Note O to the Consolidated Financial Statements in Part I Item 1 of this Form 10-Q.

The Company utilizes a Receivables Purchase Agreement facility to sell up to $150 of certain receivables through an SPE to a financial institution on a revolving basis. Alcoa Corporation guarantees the performance obligations of the Company subsidiaries, and unsold customer receivables are pledged as collateral to the financial institution to secure the sold receivables. At March 31, 2025, the SPE held unsold customer receivables of $331 pledged as collateral against the sold receivables.

The Company continues to service the customer receivables that were transferred to the financial institution. As Alcoa collects customer payments, the SPE transfers additional receivables to the financial institution rather than remitting cash. In the three-month period of 2025, the Company sold gross customer receivables of $199 and reinvested collections of $199 from previously sold receivables, resulting in no net cash remittance to or proceeds from the financial institution. In the three-month period of 2024, the Company sold gross customer receivables of $307 and reinvested collections of $291 from previously sold receivables, resulting in net cash proceeds from the financial institution of $16. Cash collections from previously sold receivables yet to be reinvested of $90 were included in Accounts payable, trade on the accompanying Consolidated Balance Sheet as of March 31, 2025. Cash received from sold receivables under the agreement are presented within operating activities in the Statement of Consolidated Cash Flows. See Note I to the Consolidated Financial Statements in Part I Item 1 of this Form 10-Q.

37

During the first quarter of 2025, Alcoa entered into financial contracts with multiple counterparties to mitigate financial risks associated with changes in aluminum prices, natural gas prices, and foreign currency exchange rates. The aluminum and natural gas financial contracts qualify for cash flow hedge accounting. The foreign exchange financial contracts do not qualify for hedge accounting treatment. These contracts are held by a separate wholly-owned subsidiary of Alcoa Corporation and are intended to limit the Company’s net cash outlays to the committed funding under the San Ciprián joint venture agreement. The associated realized gains or losses have no impact on the results of the San Ciprián operations.

Financing Activities

Cash provided from financing activities was $77 in the three-month period of 2025 compared with $754 in the same period of 2024.

The source of cash in the three-month period of 2025 was primarily $985 net proceeds from the bond issuance (see below), $27 of contributions from IGNIS EQT (see Noncontrolling interest above), partially offset by $890 used to settle cash tender offers on existing debt (see below), and $26 of dividends paid on common stock.

The source of cash in the three-month period of 2024 was primarily $737 net proceeds from the debt issuance for $750 aggregate principal amount of 7.125% Senior Notes due 2031 and $55 of net contributions from Alumina Limited (see Noncontrolling interest above), partially offset by $19 of dividends paid on common stock.

Short-term Borrowings

The Company entered into inventory repurchase agreements whereby the Company sold aluminum to a third party and agreed to subsequently repurchase substantially similar inventory. The Company did not record sales upon each shipment of inventory and the net cash received of $45 related to these agreements was recorded in Short-term borrowings within Other current liabilities on the Consolidated Balance Sheet as of March 31, 2025.

During the three-month period of 2025, the Company recorded borrowings of $44 and repurchased $49 of inventory related to these agreements. During the three-month period of 2024, the Company recorded borrowings of $21 and repurchased $25 of inventory related to these agreements.

The cash received and subsequently paid under the inventory repurchase agreements is included in Cash provided from financing activities on the Statement of Consolidated Cash Flows.

144A Debt

In March 2025, Alumina Pty Ltd, a wholly-owned subsidiary of Alcoa Corporation, completed Rule 144A (U.S. Securities Act of 1933, as amended) debt issuances of $500 aggregate principal amount of 6.125% Senior Notes due 2030 (the 2030 Notes) and $500 aggregate principal amount of 6.375% Senior Notes due 2032 (the 2032 Notes, and, collectively with the 2030 Notes, the Notes). The net proceeds of these issuances were $985, reflecting a discount to the initial purchasers of the Notes as well as issuance costs.

In March 2025, ANHBV announced and settled cash tender offers which resulted in the tender and acceptance of $609 of the $750 aggregate principal amount of Existing 2027 Notes and $281 of the $500 aggregate principal amount of Existing 2028 Notes for purchase.

See Note K to the Consolidated Financial Statements in Part I Item 1 of this Form 10-Q.

Credit Facilities

Revolving Credit Facility

The Company and ANHBV, a wholly-owned subsidiary of Alcoa Corporation and the borrower, have a $1,250 revolving credit and letter of credit facility in place for working capital and/or other general corporate purposes (the Revolving Credit Facility). The Revolving Credit Facility, established in September 2016, most recently amended and restated in June 2022 and amended in January 2024, is scheduled to mature in June 2027. Subject to the terms and conditions under the Revolving Credit Facility, the Company or ANHBV may borrow funds or issue letters of credit. Under the terms of the January 2024 amendment, the Company agreed to provide collateral for its obligations under the Revolving Credit Facility. See Part II Item 8 of Alcoa Corporation’s Annual Report on Form 10-K in Note M to the Consolidated Financial Statements for the year ended December 31, 2024 for more information on the Revolving Credit Facility.

As of March 31, 2025, the Company was in compliance with all financial covenants. The Company may access the entire amount of commitments under the Revolving Credit Facility. There were no borrowings outstanding at March 31, 2025 and no amounts were borrowed during the three-month periods of 2025 and 2024 under the Revolving Credit Facility.

38

Japanese Yen Revolving Credit Facility

The Company and ANHBV have a $250 revolving credit facility available to be drawn in Japanese yen (the Japanese Yen Revolving Credit Facility). Subject to the terms and conditions under the facility, the Company or ANHBV may borrow funds. The Japanese Revolving Credit Facility, established in April 2023 and amended in January 2024 and April 2024, includes covenants that are substantially the same as those included in the Revolving Credit Facility. Under the terms of the January 2024 amendment, the Company agreed to provide collateral for its obligations under the Japanese Yen Revolving Credit Facility. See Part II Item 8 of Alcoa Corporation’s Annual Report on Form 10-K in Note M to the Consolidated Financial Statements for the year ended December 31, 2024 for more information on the Japanese Yen Revolving Credit Facility.

As of March 31, 2025, the Company was in compliance with all financial covenants. The Company may access the entire amount of commitments under the Japanese Revolving Credit Facility. There were no borrowings outstanding at March 31, 2025. During the three-month period of 2025, no amounts were borrowed. During the three-month period of 2024, $201 (29,686 JPY) was borrowed and $196 (29,686 JPY) was repaid under the Japanese Yen Revolving Credit Facility.

In April 2025, the Company and ANHBV entered into an amendment to the Japanese Yen Revolving Credit Facility, reducing the aggregate commitments from $250 to $200 and extending maturity from April 2025 to April 2026.

Other

In April 2025, the Company amended a $74 term loan extending maturity from May 2025 to November 2025.

Dividend

On February 20, 2025, the Board of Directors declared a quarterly cash dividend of $0.10 per share of the Company’s common stock (including common stock underlying CDIs) and Series A convertible preferred stock, to stockholders of record as of the close of business on March 4, 2025. In March 2025, the Company paid cash dividends of $26.

Ratings

Alcoa Corporation’s cost of borrowing and ability to access the capital markets are affected not only by market conditions but also by the short- and long-term debt ratings assigned to Alcoa Corporation’s debt by the major credit rating agencies.

On March 3, 2025, Standard and Poor’s Global Ratings affirmed the rating of Alcoa Corporation’s long-term debt as BB and revised the outlook from stable to positive.

On March 3, 2025, Moody’s Investor Service affirmed the rating of ANHBV’s long-term debt as Ba1 and affirmed the outlook as stable and published Alumina Pty Ltd’s long-term debt rating as Ba1 with a stable outlook.

On March 3, 2025, Fitch Ratings published Alumina Pty Ltd’s long-term debt rating as BB+ with a stable outlook.

On February 28, 2025, Fitch Ratings affirmed the rating for Alcoa Corporation and ANHBV’s long-term debt as BB+ and affirmed the outlook as stable.

Ratings are not a recommendation to buy or hold any of Alcoa’s securities and they may be revised or revoked at any time at the sole discretion of the rating organization.

Investing Activities

Cash used for investing activities was $108 in the three-month period of 2025 compared with $117 for the same period of 2024.

In the three-month period of 2025, the use of cash was primarily attributable to $93 related to capital expenditures and $15 of cash contributions to the ELYSIS partnership.

In the three-month period of 2024, the use of cash was primarily attributable to $101 related to capital expenditures and $17 of cash contributions to the ELYSIS partnership.

Recently Adopted and Recently Issued Accounting Guidance

See Note B to the Consolidated Financial Statements in Part I Item 1 of this Form 10-Q.

Dissemination of Company Information

Alcoa Corporation intends to make future announcements regarding company developments and financial performance through its website, https://www.alcoa.com, as well as through press releases, filings with the Securities and Exchange Commission, conference calls, media broadcasts, and webcasts.

39

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

See Part II Item 7A Quantitative and Qualitative Disclosures About Market Risk of Alcoa Corporation’s Annual Report on Form 10-K for the year ended December 31, 2024. Our exposure to market risk has not changed materially since December 31, 2024. Refer to Part I Item 1 of this Form 10-Q in Note M to the Consolidated Financial Statements under caption Derivatives for additional information.

Item 4. Controls and Procedures.

(a) Evaluation of Disclosure Controls and Procedures

Alcoa Corporation’s Chief Executive Officer and Chief Financial Officer have evaluated the Company’s disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) of the U.S. Securities Exchange Act of 1934, as amended, as of the end of the period covered by this report, and they have concluded that these controls and procedures were effective as of March 31, 2025.

(b) Changes in Internal Control over Financial Reporting

There have been no changes in internal control over financial reporting during the first quarter of 2025, that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II – OTHER INFORMATION

Item 1. Legal Proceedings.

(dollars in millions)

In the ordinary course of its business, Alcoa is involved in a number of lawsuits and claims, both actual and potential. Various lawsuits, claims, and proceedings have been or may be instituted or asserted against Alcoa Corporation, including those pertaining to environmental, safety and health, commercial, tax, product liability, intellectual property infringement, governance, employment, employee and retiree benefit matters, and other actions and claims arising out of the normal course of business. While the amounts claimed in these other matters may be substantial, the ultimate liability is not readily determinable because of the considerable uncertainties that exist. Accordingly, it is possible that the Company’s liquidity or results of operations in a particular period could be materially affected by one or more of these other matters. However, based on facts currently available, management believes that the disposition of these other matters that are pending or asserted will not have a material adverse effect, individually or in the aggregate, on the financial position of the Company.

SEC regulations require disclosure of certain environmental matters when a governmental authority is a party to the proceedings and such proceedings involve potential monetary sanctions that Alcoa Corporation reasonably believes will exceed a specified threshold. Pursuant to these regulations, the Company uses a threshold of $1 for purposes of determining whether disclosure of any such proceedings is required.

A discussion of our material pending lawsuits and claims can be found in Part I Item 3 Legal Proceedings of Alcoa Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024. See Part I Item 1 of this Form 10-Q in Note O to the Consolidated Financial Statements for additional information regarding legal proceedings.

Item 1A. Risk Factors.

We face a number of risks that could materially and adversely affect our business, results of operations, cash flow, liquidity, or financial condition. A full discussion of our risk factors can be found in Part I Item 1A. Risk Factors of Alcoa Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024.

40

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

(dollars in millions, except share and per-share amounts)

Issuer Purchases of Equity Securities

The table below sets forth information regarding the repurchase of shares of our common stock during the periods indicated.

Period	Total Number of Shares Purchased		Weighted Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Program		Approximate Dollar Value of Shares that May Yet be Purchased Under the Program(1)
January 1 to January 31		—		—		—	$	500
February 1 to February 28		—		—		—		500
March 1 to March 31		—		—		—		500
Total		—		—		—

(1)On July 20, 2022, Alcoa Corporation announced that its Board of Directors approved a common stock repurchase program under which the Company may purchase shares of its outstanding common stock up to an aggregate transactional value of $500, depending on the Company’s continuing analysis of market, financial, and other factors (the July 2022 authorization).

As of the date of this report, the Company is currently authorized to repurchase up to a total of $500, in the aggregate, of its outstanding shares of common stock under the July 2022 authorization. Repurchases under this program may be made using a variety of methods, which may include open market purchases, privately negotiated transactions, or pursuant to a Rule 10b5-1 plan. This program may be suspended or discontinued at any time and does not have a predetermined expiration date. Alcoa Corporation intends to retire repurchased shares of common stock.

Item 5. Other Information.

Trading Arrangements

None of the Company’s directors or “officers,” as defined in Rule 16a-1(f) of the Exchange Act, adopted, modified, or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408 of Regulation S-K, during the Company’s fiscal quarter ended March 31, 2025.

41

Item 6. Exhibits.

4.1	Indenture, dated as of March 17, 2025, among Alumina Pty Ltd, Alcoa Corporation, certain subsidiaries of Alcoa Corporation, and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed March 17, 2025 (File No. 1-37816))
31.1	Certification of Principal Executive Officer required by Rule 13a-14(a) or 15d-14(a) (filed herewith)
31.2	Certification of Principal Financial Officer required by Rule 13a-14(a) or 15d-14(a) (filed herewith)
32.1	Certification of Principal Executive Officer required by Rule 13a-14(b) or Rule 15d-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code (furnished herewith)
32.2	Certification of Principal Financial Officer required by Rule 13a-14(b) or Rule 15d-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code (furnished herewith)
101.INS	Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH	Inline XBRL Taxonomy Extension Schema with Embedded Linkbases Document
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

42

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Alcoa Corporation
May 1, 2025	/s/ Molly S. Beerman
Date	Molly S. Beerman
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)
May 1, 2025	/s/ Renee R. Henry
Date	Renee R. Henry
	Senior Vice President and Controller
	(Principal Accounting Officer)

43

EX-31.1

EXHIBIT 31.1

Certifications

I, William F. Oplinger, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Alcoa Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 1, 2025
	/s/ William F. Oplinger
	Name:	William F. Oplinger
	Title:	President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

Certifications

I, Molly S. Beerman, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Alcoa Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 1, 2025
	/s/ Molly S. Beerman
	Name:	Molly S. Beerman
	Title:	Executive Vice President and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

Certification

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code), the undersigned officer of Alcoa Corporation, a Delaware corporation (the “Company”), does hereby certify that:

1.The Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (the “Form 10-Q”) of the Company fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and,

2.The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 1, 2025	/s/ William F. Oplinger
	Name:	William F. Oplinger
	Title:	President and Chief Executive Officer

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

The foregoing certification is being furnished to the Securities and Exchange Commission as an exhibit to the Form 10-Q and shall not be considered filed as part of the Form 10-Q.

EX-32.2

EXHIBIT 32.2

Certification

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code), the undersigned officer of Alcoa Corporation, a Delaware corporation (the “Company”), does hereby certify that:

1.The Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (the “Form 10-Q”) of the Company fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and,

2.The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 1, 2025	/s/ Molly S. Beerman
	Name:	Molly S. Beerman
	Title:	Executive Vice President and Chief Financial Officer

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

The foregoing certification is being furnished to the Securities and Exchange Commission as an exhibit to the Form 10-Q and shall not be considered filed as part of the Form 10-Q.

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2025	Apr. 28, 2025
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Trading Symbol	AA
Entity Registrant Name	ALCOA CORP
Entity Central Index Key	0001675149
Entity File Number	1-37816
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-1789115
Entity Address, Address Line One	201 Isabella Street
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Pittsburgh
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15212-5858
City Area Code	412
Local Phone Number	315-2900
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, par value $0.01 per share
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false
Common Stock, Par Value $0.01 Per Share {Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		258,902,338
Series A Convertible Preferred Stock, Par Value $0.01 Per Share [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		4,041,989

XML

Statement of Consolidated Operations (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Sales (E)	$ 3,369	$ 2,599
Cost of goods sold (exclusive of expenses below)	2,438	2,404
Selling, general administrative, and other expenses	71	60
Research and development expenses	12	11
Provision for depreciation, depletion, and amortization	148	161
Restructuring and other charges, net (D)	5	202
Interest expense	53	27
Other (income) expenses, net (P)	(26)	59
Total costs and expenses	2,701	2,924
Consolidated income (loss) before income taxes	668	(325)
Provision for (benefit from) income taxes	120	(18)
Net income (loss)	548	(307)
Less: Net loss attributable to noncontrolling interest	0	(55)
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	$ 548	$ (252)
EARNINGS PER SHARE ATTRIBUTABLE TO ALCOA CORPORATION COMMON SHAREHOLDERS (F):
Basic	$ 2.08	$ (1.41)
Diluted	$ 2.07	$ (1.41)

XML

Statement of Consolidated Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	$ 548	$ (252)
Net income (loss), Noncontrolling interest	0	(55)
Net income (loss)	548	(307)
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	5	9
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	0	1
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	5	10
Foreign currency translation adjustments, Alcoa Corporation	185	(122)
Foreign currency translation adjustments, Noncontrolling interest	0	(54)
Foreign currency translation adjustments	185	(176)
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	16	130
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	0	0
Net change in unrecognized gains/losses on cash flow hedges	16	130
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	206	17
Total Other comprehensive income (loss), net of tax, Noncontrolling interest	0	(53)
Total Other comprehensive income (loss), net of tax	206	(36)
Comprehensive income (loss), Alcoa Corporation	754	(235)
Comprehensive income (loss), Noncontrolling interest	0	(108)
Comprehensive income (loss)	$ 754	$ (343)

XML

Consolidated Balance Sheet (unaudited) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents (M)	$ 1,202	$ 1,138
Receivables from customers (I)	1,203	1,096
Other receivables	144	143
Inventories (J)	2,182	1,998
Fair value of derivative instruments (M)	38	25
Prepaid expenses and other current assets	438	514
Total current assets	5,207	4,914
Properties, plants, and equipment	19,982	19,550
Less: accumulated depreciation, depletion, and amortization	13,485	13,161
Properties, plants, and equipment, net	6,497	6,389
Investments (H)	1,011	980
Deferred income taxes	306	284
Fair value of derivative instruments (M)	11	0
Other noncurrent assets (P)	1,542	1,497
Total assets	14,574	14,064
Current liabilities:
Accounts payable, trade	1,629	1,805
Accrued compensation and retirement costs	318	362
Taxes, including income taxes	94	102
Fair value of derivative instruments (M)	258	263
Other current liabilities	665	788
Long-term debt due within one year (K & M)	75	75
Total current liabilities	3,039	3,395
Long-term debt, less amount due within one year (K & M)	2,573	2,470
Accrued pension benefits (L)	239	256
Accrued other postretirement benefits (L)	406	412
Asset retirement obligations	683	691
Environmental remediation (O)	169	182
Fair value of derivative instruments (M)	850	836
Noncurrent income taxes	53	9
Other noncurrent liabilities and deferred credits	644	656
Total liabilities	8,656	8,907
CONTINGENCIES AND COMMITMENTS (O)
MEZZANINE EQUITY
Noncontrolling interest (C)	103	0
Alcoa Corporation shareholders’ equity:
Preferred stock	0	0
Common stock	3	3
Additional capital	11,548	11,587
Accumulated deficit	(801)	(1,323)
Accumulated other comprehensive loss (G)	(4,935)	(5,110)
Total equity	5,815	5,157
Total liabilities, mezzanine equity, and equity	$ 14,574	$ 14,064

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Statement of Consolidated Cash Flows (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
CASH FROM OPERATIONS
Net income (loss)	$ 548	$ (307)
Adjustments to reconcile net income (loss) to cash from operations:
Depreciation, depletion, and amortization	148	161
Deferred income taxes	50	(63)
Equity (income) loss, net of dividends (H)	(9)	23
Restructuring and other charges, net (D)	5	202
Net loss from investing activities - asset sales (P)	3	11
Net periodic pension benefit cost (L)	5	3
Stock-based compensation	11	10
(Gain) loss on mark-to-market derivative financial contracts	(5)	2
Other	35	20
Changes in assets and liabilities, excluding effects of divestitures and foreign currency translation adjustments:
Increase in receivables	(85)	(212)
(Increase) decrease in inventories	(155)	71
Decrease (increase) in prepaid expenses and other current assets	87	(6)
Decrease in accounts payable, trade	(206)	(98)
Decrease in accrued expenses	(206)	(22)
(Decrease) increase in taxes, including income taxes	(27)	18
Pension contributions (L)	(12)	(6)
(Increase) decrease in noncurrent assets	(47)	9
Decrease in noncurrent liabilities	(65)	(39)
CASH PROVIDED FROM (USED FOR) OPERATIONS	75	(223)
FINANCING ACTIVITIES
Additions to debt (K)	1,033	965
Payments on debt (K)	(946)	(221)
Dividends paid on Alcoa common stock	(26)	(19)
Payments related to tax withholding on stock-based compensation awards	(5)	(15)
Financial contributions for the divestiture of businesses (C)	(2)	(7)
Contributions from noncontrolling interest (C)	27	61
Distributions to noncontrolling interest	0	(6)
Other	(4)	(4)
CASH PROVIDED FROM FINANCING ACTIVITIES	77	754
INVESTING ACTIVITIES
Capital expenditures	(93)	(101)
Proceeds from the sale of assets	0	1
Additions to investments	(15)	(17)
CASH USED FOR INVESTING ACTIVITIES	(108)	(117)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	12	(6)
Net change in cash and cash equivalents and restricted cash	56	408
Cash and cash equivalents and restricted cash at beginning of year	1,234	1,047
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	$ 1,290	$ 1,455

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Statement of Changes in Consolidated Mezzanine Equity and Equity (unaudited) - USD ($) $ in Millions	Total	Non-controlling Interest [Member]	Common Stock [Member]	Additional Capital [Member]	Accumulated Deficit [Member]	Accumulated other comprehensive (loss) income [Member]	Non-controlling Interest [Member]
Balance at Dec. 31, 2023	$ 5,845		$ 2	$ 9,187	$ (1,293)	$ (3,645)	$ 1,594
Net income (loss)	(307)				(252)		(55)
Other comprehensive income (loss) (G)	(36)					17	(53)
Stock-based compensation	10			10
Net effect of tax withholding for compensation plans and exercise of stock options	(15)			(15)
Dividends paid on Alcoa common stock ($0.10 per share)	(19)				(19)
Contributions	61						61
Distributions	(6)						(6)
Other	1			2			(1)
Balance at Mar. 31, 2024	5,534		2	9,184	(1,564)	(3,628)	$ 1,540
Balance at Dec. 31, 2024	5,157		3	11,587	(1,323)	(5,110)
Balance at Dec. 31, 2024	0	$ 0
Net income (loss)	548				548
Other comprehensive income (loss) (G)	206					206
Stock-based compensation	11			11
Net effect of tax withholding for compensation plans and exercise of stock options	(5)			(5)
Dividends paid on Alcoa preferred stock ($0.10 per share)	0				0
Dividends paid on Alcoa common stock ($0.10 per share)	(26)				(26)
Joint venture formation (C)	(76)	103		(45)		(31)
Balance at Mar. 31, 2025	5,815		$ 3	$ 11,548	$ (801)	$ (4,935)
Balance at Mar. 31, 2025	$ 103	$ 103

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Statement of Changes in Consolidated Mezzanine Equity and Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Stockholders' Equity [Abstract]
Preferred stock dividends per share	$ 0.1
Common stock dividends per share	$ 0.1	$ 0.1

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Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pay vs Performance Disclosure
Net Income (Loss)	$ 548	$ (252)

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Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2025
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Rule 10b51 Arr Modified Flag	false
Non Rule 10b51 Arr Modified Flag	false

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Basis of Presentation

3 Months Ended

Mar. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

A. Basis of Presentation – The interim Consolidated Financial Statements of Alcoa Corporation and its subsidiaries (Alcoa Corporation, Alcoa, or the Company) 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 Quarterly Report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, which includes disclosures required by GAAP.

In accordance with GAAP, certain situations require management to make estimates based on judgments and assumptions, which may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements. They also may affect the reported amounts of revenues and expenses during the reporting periods. Management uses historical experience and all available information to make these estimates. Management regularly evaluates the judgments and assumptions used in its estimates, and results could differ from those estimates upon future events and their effects or new information.

Principles of Consolidation. The Consolidated Financial Statements of the Company include the accounts of Alcoa Corporation and companies in which Alcoa Corporation has a controlling interest, including those that comprise the San Ciprián joint venture (see Note C). Intercompany transactions have been eliminated. The equity method of accounting is used for investments in affiliates and other joint ventures over which the Company has significant influence but does not have effective control. Investments in affiliates in which Alcoa Corporation cannot exercise significant influence are accounted for at cost less any impairment, a measurement alternative in accordance with GAAP.

Prior to Alcoa’s acquisition of Alumina Limited on August 1, 2024 (see Note C), Alcoa consolidated its 60% ownership in the entities comprising the Alcoa World Alumina & Chemicals (AWAC) joint venture and Alumina Limited’s interest in the equity of such entities was reflected as Noncontrolling interest within Equity on the accompanying Consolidated Balance Sheet.

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Recently Adopted and Recently Issued Accounting Guidance

3 Months Ended

Mar. 31, 2025

Accounting Standards Update and Change in Accounting Principle [Abstract]

Recently Adopted and Recently Issued Accounting Guidance

B. Recently Adopted and Recently Issued Accounting Guidance

In November 2024, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (ASU) No. 2024-03 which requires detailed disclosures about the types of expenses (including purchases of inventory, employee compensation, depreciation, amortization, and depletion) included within commonly presented expense captions (including cost of goods sold; selling, general administrative, and other expense; and research and development expenses). The guidance is effective for annual periods beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. The adoption of this guidance will not have a material impact on the Company’s financial position or results of operations and will provide enhanced disclosures regarding expenses beginning in the Company’s Annual Report on Form 10-K for the year ended December 31, 2027.

In December 2023, the FASB issued ASU No. 2023-09 which includes changes to income tax disclosures, including greater disaggregation of information in the rate reconciliation and disclosure of taxes paid by jurisdiction. The guidance is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The adoption of this guidance will not have a material impact on the Company’s financial position or results of operations and will provide enhanced disclosures regarding income taxes beginning in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025.

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Acquisitions and Divestitures

3 Months Ended

Mar. 31, 2025

Business Combinations [Abstract]

Acquisition and Divestitures

C. Acquisitions and Divestitures

San Ciprián Joint Venture

On March 31, 2025, Alcoa and IGNIS Equity Holdings, SL (IGNIS EQT) entered into a joint venture agreement whereby Alcoa owns 75% and continues as the managing operator and IGNIS EQT owns 25% of the San Ciprián operations.

Alcoa and IGNIS EQT contributed $81 (€75) and $27 (€25), respectively, to form the joint venture. Additionally, up to approximately $108 (€100) may be funded by Alcoa as needed for operations with a priority position in future cash returns. Further funding requires agreement by both partners and would be shared 75% by Alcoa and 25% by IGNIS EQT.

The transaction was accounted for as an equity transaction where IGNIS EQT’s noncontrolling interest was reflected as a decrease to Additional capital on the accompanying Consolidated Balance Sheet. Noncontrolling interest was measured at 25% of the net assets included in the joint venture at formation ($103), which includes the contributions described above ($108). Additionally, certain amounts related to foreign currency translation adjustments previously included within Accumulated other comprehensive loss ($31) were reclassified to Additional capital.

Under the terms of the joint venture agreement, IGNIS EQT has a put option whereby IGNIS EQT can require Alcoa Corporation to purchase from IGNIS EQT its 25% interest at the then fair market value upon certain change in control provisions. Alcoa classified the Noncontrolling interest within Mezzanine equity on the Consolidated Balance Sheet, as IGNIS EQT’s redemption is not solely within the Company’s control. Alcoa will recognize earnings attributable to IGNIS EQT’s ownership interest within Noncontrolling interest beginning in the second quarter of 2025.

Alumina Limited Acquisition

On August 1, 2024, Alcoa completed the acquisition of all of the ordinary shares of Alumina Limited (Alumina Shares) through a wholly-owned subsidiary, AAC Investments Australia 2 Pty Ltd. At acquisition, Alumina Limited held a 40% ownership interest in the AWAC joint venture, consisting of several affiliated operating entities, which own, have an interest in, or operate the bauxite mines and alumina refineries within Alcoa Corporation’s Alumina segment (except for the Poços de Caldas mine and refinery and portions of the São Luís refinery, all in Brazil) and a portion (55%) of the Portland smelter (Australia) within Alcoa Corporation’s Aluminum segment. Upon completion of the Alumina Limited acquisition, Alumina Limited and, as a result, the operations held by the AWAC joint venture, became wholly-owned subsidiaries of Alcoa Corporation.

Earnings attributable to Alumina Limited’s ownership interest were recognized within Noncontrolling interest through July 31, 2024.

Saudi Arabia Joint Venture

On September 15, 2024, Alcoa entered into a share purchase and subscription agreement with Saudi Arabian Mining Company (Ma’aden), pursuant to which Alcoa agreed to sell its full ownership interest of 25.1% in the Saudi Arabia joint venture, comprised of the Ma’aden Bauxite and Alumina Company and the Ma’aden Aluminium Company, to Ma’aden in exchange for issuance by Ma’aden of 85,977,547 shares and $150 in cash. The implied value of the shares was $950 as of September 12, 2024, based on the volume-weighted average share price of Ma’aden for the previous 30 calendar days. The shares of Ma’aden will be subject to transfer and sale restrictions, including a restriction requiring Alcoa to hold its Ma’aden shares for a minimum of three years, with one-third of the shares becoming transferable after each of the third, fourth, and fifth anniversaries of closing of the transaction (the holding period). During the holding period, Alcoa would be permitted to hedge and borrow against its Ma’aden shares. Under certain circumstances, such minimum holding period would be reduced. The transaction is subject to regulatory approvals, approval by Ma’aden’s shareholders, and other customary closing conditions and is expected to close in the second quarter of 2025. The carrying value of Alcoa’s investment was $553 as of March 31, 2025. The transaction is subject to capital gains tax in Saudi Arabia of approximately $65 based on the implied value of the shares as of September 12, 2024.

Warrick Rolling Mill Divestiture

In March 2021, Alcoa completed the sale of its rolling mill located at Warrick Operations (Warrick Rolling Mill) and recorded estimated liabilities for site separation commitments. In the first quarters of 2025 and 2024, the Company spent $2 and $7 against the reserve, respectively. In the first quarter of 2024, the Company recorded a charge of $11 in Other (income) expenses, net on the Statement of Consolidated Operations related to these commitments. The remaining balance of $6 at March 31, 2025 is expected to be spent in 2025. The cash spent against the reserve is included in Cash provided from financing activities on the Statement of Consolidated Cash Flows.

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Restructuring and Other Charges, Net

3 Months Ended

Mar. 31, 2025

Restructuring and Related Activities [Abstract]

Restructuring and Other Charges, Net

D. Restructuring and Other Charges, Net

In the first quarter of 2025, Alcoa Corporation recorded Restructuring and other charges, net, of $5 which were primarily comprised of:

•A charge of $3 for certain employee obligations related to the February 2023 updated viability agreement reached with the workers’ representatives of the San Ciprián aluminum smelter related to the restart of the smelter; and,

•A charge of $2 for take-or-pay contract costs at a previously closed site.

In the first quarter of 2024, Alcoa Corporation recorded Restructuring and other charges, net, of $202 which were primarily comprised of a charge of $197 for the curtailment of the Kwinana (Australia) alumina refinery.

In June 2024, Alcoa completed the full curtailment of the Kwinana refinery, as planned, which was announced in January 2024. As of March 2025, the refinery had approximately 240 employees to manage certain processes that are expected to continue until about the fourth quarter of 2025. At that time, the employee number will be further reduced to approximately 50. In the first quarter of 2024, the Company recorded charges of $197 in Restructuring and other charges, net on the Statement of Consolidated Operations comprised of other costs of $136 for water management costs ($123) and take-or-pay contracts ($13), severance and employee termination costs of $41, asset retirement obligations of $15, and asset impairments of $5. The Company recorded net charges of $8 and $82 in Restructuring and other charges, net on the Statement of Consolidated Operations in the second quarter and fourth quarter of 2024, respectively, comprised of others costs of $96, partially offset by an adjustment to decrease the asset retirement obligation by $6. Payments related to other costs were $41 in the first quarter of 2025. Remaining cash outlays of approximately $100 are expected to be spent in 2025.

Alcoa Corporation does not include Restructuring and other charges, net in the results of its reportable segments. The impact of allocating such charges to segment results would have been as follows:

	First quarter ended March 31,
	2025		2024
Alumina	$	—	$	197
Aluminum		3		—
Segment total		3		197
Corporate		2		5
Total Restructuring and other charges, net	$	5	$	202

Activity and reserve balances for restructuring charges were as follows:

	Severance and employee termination costs			Other costs			Total
Balance at December 31, 2023	$	6		$	57		$	63
Restructuring and other charges, net		44			264			308
Cash payments		(38	)		(145	)		(183	)
Reversals and other		1			(8	)		(7	)
Balance at December 31, 2024		13			168			181
Restructuring and other charges, net		—			5			5
Cash payments		(1	)		(48	)		(49	)
Reversals and other		(1	)		4			3
Balance at March 31, 2025	$	11		$	129		$	140

The activity and reserve balances include only Restructuring and other charges, net that impacted the reserves for Severance and employee termination costs and Other costs. Restructuring and other charges, net that affected other liability accounts such as Accrued pension benefits (see Note L), Asset retirement obligations, and Environmental remediation (see Note O) are excluded from the above activity and balances. Reversals and other includes reversals of previously recorded liabilities and foreign currency translation impacts.

The noncurrent portion of the reserve was $9 and $8 at March 31, 2025 and December 31, 2024, respectively.

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Segment Information

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Segment Information

E. Segment Information – Alcoa Corporation is a producer of bauxite, alumina, and aluminum products. The Company has two operating and reportable segments: (i) Alumina and (ii) Aluminum. The primary measure of performance reported to Alcoa Corporation’s President and Chief Executive Officer (identified as the Company’s CODM) is Adjusted EBITDA (Earnings before interest, taxes, depreciation, and amortization) for each segment.

The Company calculates Segment Adjusted EBITDA as Total sales (third-party and intersegment) minus the following items: Cost of goods sold; Selling, general administrative, and other expenses; and Research and development expenses. Alcoa Corporation’s Segment Adjusted EBITDA may not be comparable to similarly titled measures of other companies. The CODM regularly reviews Segment Adjusted EBITDA to assess performance and allocate resources (including employees, property, and financial or capital resources) in the planning and strategic review process.

The operating results, capital expenditures, and assets of Alcoa Corporation’s reportable segments were as follows (differences between segment totals and consolidated amounts are in Corporate):

	Alumina			Aluminum			Total
First quarter ended March 31, 2025
Sales:
Third-party sales	$	1,463		$	1,901		$	3,364
Intersegment sales		712			4			716
Total sales	$	2,175		$	1,905		$	4,080
Adjusted operating costs(1)		723			1,574			2,297
Other segment items(2)		788			197			985
Segment Adjusted EBITDA	$	664		$	134		$	798
Supplemental information:
Depreciation, depletion, and amortization	$	76		$	67		$	143
Equity income (loss)		15			(6	)		9
Capital expenditures		53			37			90
First quarter ended March 31, 2024
Sales:
Third-party sales	$	961		$	1,638		$	2,599
Intersegment sales		395			4			399
Total sales	$	1,356		$	1,642		$	2,998
Adjusted operating costs(1)		796			1,279			2,075
Other segment items(2)		421			313			734
Segment Adjusted EBITDA	$	139		$	50		$	189
Supplemental information:
Depreciation, depletion, and amortization	$	87		$	68		$	155
Equity (loss) income		(11	)		2			(9	)
Capital expenditures		57			41			98
March 31, 2025
Assets:
Equity investments	$	443		$	553		$	996
Segment assets		6,295			6,269			12,564
December 31, 2024
Assets:
Equity investments	$	420		$	546		$	966
Segment assets		6,138			6,129			12,267

(1)Adjusted operating costs include all production related costs for alumina or aluminum produced and shipped: raw materials consumed; conversion costs, such as labor, materials, and utilities; and plant administrative expenses.

(2)Other segment items include costs associated with trading activity, the Alumina segment’s purchase of bauxite from offtake or other supply agreements, the Alumina segment’s commercial shipping services, and the Aluminum segment’s energy assets; other direct and non-production related charges; Selling, general administrative, and other expenses; and Research and development expenses.

The following table reconciles Total Segment Adjusted EBITDA to Consolidated net income (loss) attributable to Alcoa Corporation:

	First quarter ended March 31,
	2025			2024
Total Segment Adjusted EBITDA	$	798		$	189
Unallocated amounts:
Transformation(1)		(12	)		(14	)
Intersegment eliminations		103			(8	)
Corporate expenses(2)		(37	)		(34	)
Provision for depreciation, depletion, and amortization		(148	)		(161	)
Restructuring and other charges, net (D)		(5	)		(202	)
Interest expense		(53	)		(27	)
Other income (expenses), net (P)		26			(59	)
Other(3)		(4	)		(9	)
Consolidated income (loss) before income taxes		668			(325	)
(Provision for) benefit from income taxes		(120	)		18
Net loss attributable to noncontrolling interest		—			55
Consolidated net income (loss) attributable to Alcoa Corporation	$	548		$	(252	)

(1)Transformation includes, among other items, the Adjusted EBITDA of previously closed operations.

(2)Corporate expenses are composed of general administrative and other expenses of operating the corporate headquarters and other global administrative facilities, as well as research and development expenses of the corporate technical center.

(3)Other includes certain items that are not included in the Adjusted EBITDA of the reportable segments.

The following table details Alcoa Corporation’s Sales by product division:

	First quarter ended March 31,
	2025			2024
Aluminum	$	1,955		$	1,661
Alumina		1,211			890
Bauxite		242			61
Energy		33			33
Other(1)		(72	)		(46	)
	$	3,369		$	2,599

(1)Other includes realized gains and losses related to embedded derivative instruments designated as cash flow hedges of forward sales of aluminum (see Note M).

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Earnings Per Share

3 Months Ended

Mar. 31, 2025

Earnings Per Share [Abstract]

Earnings Per Share

F. Earnings Per Share

Basic earnings per share (EPS) is calculated using the two-class method. Under the two-class method, earnings are allocated to Alcoa common stock and preferred stock based on the pro-rata share of each class outstanding. Diluted EPS assumes the issuance of common stock for all potentially dilutive share equivalents outstanding. Diluted EPS is calculated under both the two-class and if-converted methods, and the more dilutive amount is reported.

In the first quarter of 2025, undistributed earnings of $9 were allocated to preferred stock under the two-class method.

The share information used to compute basic and diluted EPS attributable to Alcoa Corporation common shareholders was as follows (shares in millions):

	First quarter ended March 31,
	2025		2024
Average shares outstanding – basic		259		179
Effect of dilutive securities:
Stock options		—		—
Stock units		1		—
Average shares outstanding – diluted		260		179

In the first quarter of 2024, basic average shares outstanding and diluted average shares outstanding were the same because the effect of potential shares of common stock was anti-dilutive. Had Alcoa generated net income in the first quarter of 2024, two million common share equivalents related to three million outstanding stock units and stock options combined would have been included in diluted average shares outstanding for the period.

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Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2025

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Loss

G. Accumulated Other Comprehensive Loss

The following table details the activity of the three components that comprise Accumulated other comprehensive loss for Alcoa Corporation’s shareholders and Noncontrolling interest:

	Alcoa Corporation						Noncontrolling interest
	First quarter ended March 31,						First quarter ended March 31,
	2025			2024			2025		2024
Pension and other postretirement benefits (L)
Balance at beginning of period	$	(11	)	$	—		$	—	$	(15	)
Other comprehensive (loss) income:
Unrecognized net actuarial gain/loss and    prior service cost/benefit		(1	)		4			—		—
Tax expense(2)		(1	)		(1	)		—		—
Total Other comprehensive (loss) income    before reclassifications, net of tax		(2	)		3			—		—
Amortization of net actuarial gain/loss and    prior service cost/benefit(1)		7			6			—		1
Total amount reclassified from Accumulated    other comprehensive loss, net of tax(4)		7			6			—		1
Total Other comprehensive income		5			9			—		1
Balance at end of period	$	(6	)	$	9		$	—	$	(14	)
Foreign currency translation
Balance at beginning of period	$	(4,194	)	$	(2,593	)	$	—	$	(983	)
Other comprehensive income (loss)		185			(122	)		—		(54	)
Joint venture formation (C)		(31	)		—			—		—
Balance at end of period	$	(4,040	)	$	(2,715	)	$	—	$	(1,037	)
Cash flow hedges (M)
Balance at beginning of period	$	(905	)	$	(1,052	)	$	—	$	—
Other comprehensive (loss) income:
Net change from periodic revaluations		(85	)		117			—		—
Tax benefit (expense)(2)		23			(31	)		—		—
Total Other comprehensive (loss) income    before reclassifications, net of tax		(62	)		86			—		—
Net amount reclassified to earnings:
Aluminum contracts(3)		93			57			—		—
Foreign exchange contracts(3)		2			(4	)		—		—
Sub-total		95			53			—		—
Tax expense(2)		(17	)		(9	)		—		—
Total amount reclassified from Accumulated    other comprehensive loss, net of tax(4)		78			44			—		—
Total Other comprehensive income		16			130			—		—
Balance at end of period	$	(889	)	$	(922	)	$	—	$	—
Total Accumulated other comprehensive loss	$	(4,935	)	$	(3,628	)	$	—	$	(1,051	)

(1)These amounts were included in the computation of net periodic benefit cost for pension and other postretirement benefits (see Note L).

(2)These amounts were reported in Provision for income taxes on the accompanying Statement of Consolidated Operations.

(3)These amounts were reported in Sales on the accompanying Statement of Consolidated Operations.

(4)A positive amount indicates a corresponding charge to earnings and a negative amount indicates a corresponding benefit to earnings.

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Investments

3 Months Ended

Mar. 31, 2025

Equity Method Investments and Joint Ventures [Abstract]

Investments

H. Investments – A summary of unaudited financial information for Alcoa Corporation’s equity investments is as follows (amounts represent 100% of investee financial information):

First quarter ended March 31, 2025	Saudi Arabia Joint Venture			Mining			Energy			Other
Sales	$	956		$	168		$	58		$	111
Cost of goods sold		775			104			22			100
Net income (loss)		13			19			29			(10	)
Equity in net income (loss) of affiliated companies,    before reconciling adjustments		3			9			11			(5	)
Other		6			—			—			(7	)
Alcoa Corporation’s equity in net income (loss) of    affiliated companies		9			9			11			(12	)
First quarter ended March 31, 2024
Sales	$	711		$	115		$	63		$	115
Cost of goods sold		599			103			25			105
Net (loss) income		(8	)		(5	)		31			(16	)
Equity in net (loss) income of affiliated companies,    before reconciling adjustments		(2	)		(2	)		12			(8	)
Other		(8	)		—			(1	)		(5	)
Alcoa Corporation’s equity in net (loss) income of    affiliated companies		(10	)		(2	)		11			(13	)

The Company’s basis in the ELYSISTM Limited Partnership (ELYSIS) as of March 31, 2025 and 2024, included in Other in the table above, has been reduced to zero for its share of losses incurred to date. As a result, the Company has $60 in unrecognized losses as of March 31, 2025 that will be recognized upon additional contributions into the partnership.

On September 15, 2024, Alcoa entered into a share purchase and subscription agreement with Ma’aden, pursuant to which Alcoa agreed to sell its full ownership interest of 25.1% in the Saudi Arabia joint venture, comprised of the Ma’aden Bauxite and Alumina Company and the Ma’aden Aluminium Company, to Ma’aden in exchange for issuance by Ma’aden of 85,977,547 shares and $150 in cash (see Note C).

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Receivables

3 Months Ended

Mar. 31, 2025

Receivables [Abstract]

Receivables

I. Receivables

In November 2024, a wholly-owned special purpose entity (SPE) of the Company amended an agreement with a financial institution to increase the amount of certain customer receivables that can be transferred without recourse on a revolving basis from $130 to $150 and to extend the maturity to November 14, 2025. The agreement was initially entered into in 2023. Company subsidiaries sell customer receivables to the SPE, which then transfers the receivables to the financial institution. The Company does not maintain effective control over the transferred receivables, and therefore accounts for the transfers as sales of receivables.

Alcoa Corporation guarantees the performance obligations of the Company subsidiaries, and unsold customer receivables are pledged as collateral to the financial institution to secure the sold receivables. The SPE held unsold customer receivables of $331 and $247 pledged as collateral against the sold receivables as of March 31, 2025 and December 31, 2024, respectively.

The Company continues to service the customer receivables that were transferred to the financial institution. As Alcoa collects customer payments, the SPE transfers additional receivables to the financial institution rather than remitting cash.

In the first quarter of 2025, the Company sold gross customer receivables of $199 and reinvested collections of $199 from previously sold receivables, resulting in no net cash remittance to or proceeds from the financial institution. In the first quarter of 2024, the Company sold gross customer receivables of $307 and reinvested collections of $291 from previously sold receivables, resulting in net cash proceeds from the financial institution of $16.

Cash collections from previously sold receivables yet to be reinvested of $90 and $50 were included in Accounts payable, trade on the accompanying Consolidated Balance Sheet as of March 31, 2025 and December 31, 2024, respectively. Cash received from sold receivables under the agreement are presented within operating activities in the Statement of Consolidated Cash Flows.

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Inventories

3 Months Ended

Mar. 31, 2025

Inventory Disclosure [Abstract]

Inventories

J. Inventories

	March 31, 2025		December 31, 2024
Finished goods	$	414	$	406
Work-in-process		276		251
Bauxite and alumina		657		551
Purchased raw materials		589		546
Operating supplies		246		244
	$	2,182	$	1,998

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Debt

3 Months Ended

Mar. 31, 2025

Debt Disclosure [Abstract]

Debt

K. Debt

Short-term Borrowings

Inventory Repurchase Agreements

The Company entered into inventory repurchase agreements whereby the Company sold aluminum to a third party and agreed to subsequently repurchase substantially similar inventory. The Company did not record sales upon each shipment of inventory and the net cash received of $45 and $50 related to these agreements was recorded in Short-term borrowings within Other current liabilities on the Consolidated Balance Sheet as of March 31, 2025 and December 31, 2024, respectively. The associated inventory sold was reflected in Prepaid expenses and other current assets on the accompanying Consolidated Balance Sheet.

During the first quarter of 2025, the Company recorded borrowings of $44 and repurchased $49 of inventory related to these agreements. During the first quarter of 2024, the Company recorded borrowings of $21 and repurchased $25 of inventory related to these agreements.

The cash received and subsequently paid under the inventory repurchase agreements is included in Cash provided from financing activities on the Statement of Consolidated Cash Flows.

144A Debt

2030 and 2032 Notes

In March 2025, Alumina Pty Ltd, a wholly-owned subsidiary of Alcoa Corporation, completed Rule 144A (U.S. Securities Act of 1933, as amended) debt issuances of $500 aggregate principal amount of 6.125% Senior Notes due 2030 (the 2030 Notes) and $500 aggregate principal amount of 6.375% Senior Notes due 2032 (the 2032 Notes, and, collectively with the 2030 Notes, the Notes). The net proceeds of these issuances were $985, reflecting a discount to the initial purchasers of the Notes as well as issuance costs. The Company utilized certain proceeds of these transactions to fund contributions to Alcoa Nederland Holding B.V. (ANHBV), a wholly-owned subsidiary of Alcoa Corporation and the issuer of the outstanding $750 aggregate principal amount of 5.500% Notes due 2027 (the Existing 2027 Notes) and $500 aggregate principal amount of 6.125% Notes due 2028 (the Existing 2028 Notes). These contributions were funded through a series of intercompany transactions, including the repayment of intercompany indebtedness and the issuance of intercompany dividends. ANHBV used such funds, along with cash on hand, to fund the purchase price pursuant to the cash tender offers announced and settled in March 2025, including premiums and transaction costs (see Tender Offers). The net proceeds also support Alcoa’s general corporate purposes.

The discount to the initial purchasers of the Notes, as well as costs to complete the financing, were deferred and are being amortized to interest expense over the term of the Notes. Interest on the Notes is paid semi-annually in March and September, and interest payments will commence on September 15, 2025. The indentures contain customary affirmative and negative covenants that are similar to those included in the indenture that governs ANHBV’s 7.125% Senior Notes due 2031 issued in March 2024, such as limitations on liens, limitations on sale and leaseback transactions, and the calculation of certain financial ratios.

Alumina Pty Ltd has the option to redeem the Notes on at least 10 days, but not more than 60 days, notice to the holders of the Notes under multiple scenarios, including, in whole or in part, at any time or from time to time on and after March 15, 2027 and March 15, 2028 for the 2030 Notes and 2032 Notes, respectively, at the applicable redemption price specified in the indenture (up to 103.063% and 103.188% of the principal amount plus any accrued and unpaid interest in each case for the 2030 Notes and 2032 Notes, respectively). Also, the Notes are subject to repurchase upon the occurrence of a change in control repurchase event (as defined in the indenture) at a repurchase price in cash equal to 101% of the aggregate principal amount of the Notes repurchased, plus any accrued and unpaid interest on the Notes repurchased.

The Notes are guaranteed on a senior unsecured basis by the Company and its subsidiaries that are party to the indentures. The Notes and related guarantees rank equally in right of payment with all existing and future senior unsecured indebtedness of Alumina Pty Ltd, the Company, and such subsidiaries; rank senior in right of payment to any future subordinated obligations of Alumina Pty Ltd, the Company, and such subsidiaries; and are effectively subordinated to the existing and future secured indebtedness of Alumina Pty Ltd, the Company, and such subsidiaries, including under the Revolving Credit Agreement, to the extent of the value of property and assets securing such indebtedness.

See Part II Item 8 of Alcoa Corporation’s Annual Report on Form 10-K in Note M to the Consolidated Financial Statements for the year ended December 31, 2024 for more information related to the Company’s and such subsidiaries’ existing debt and related covenants.

Tender Offers

In March 2025, ANHBV announced and settled cash tender offers which resulted in the tender and acceptance of $609 of the $750 aggregate principal amount of Existing 2027 Notes and $281 of the $500 aggregate principal amount of Existing 2028 Notes for purchase. The issuance of the 2030 Notes and 2032 Notes and the cash tender of the Existing 2027 Notes and Existing 2028 Notes were determined to be issuances of new debt and extinguishments of existing debt. As a result, the Company incurred $12 of debt settlement expenses in the first quarter of 2025 in Interest expense, which was comprised of the settlement premiums, transaction costs, and the write-off of unamortized discounts and deferred financing costs. The cash flows related to the transaction were included in Cash provided from financing activities on the Statement of Consolidated Cash Flows.

Credit Facilities

Revolving Credit Facility

The Company and ANHBV, a wholly-owned subsidiary of Alcoa Corporation and the borrower, have a $1,250 revolving credit and letter of credit facility in place for working capital and/or other general corporate purposes (the Revolving Credit Facility). The Revolving Credit Facility, established in September 2016, most recently amended and restated in June 2022 and amended in January 2024, is scheduled to mature in June 2027. Subject to the terms and conditions under the Revolving Credit Facility, the Company or ANHBV may borrow funds or issue letters of credit. Under the terms of the January 2024 amendment, the Company agreed to provide collateral for its obligations under the Revolving Credit Facility. See Part II Item 8 of Alcoa Corporation’s Annual Report on Form 10-K in Note M to the Consolidated Financial Statements for the year ended December 31, 2024 for more information on the Revolving Credit Facility.

As of March 31, 2025, the Company was in compliance with all financial covenants. The Company may access the entire amount of commitments under the Revolving Credit Facility. There were no borrowings outstanding at March 31, 2025 and December 31, 2024, and no amounts were borrowed during the first quarters ended March 31, 2025 and March 31, 2024 under the Revolving Credit Facility.

Japanese Yen Revolving Credit Facility

The Company and ANHBV have a $250 revolving credit facility available to be drawn in Japanese yen (the Japanese Yen Revolving Credit Facility). Subject to the terms and conditions under the facility, the Company or ANHBV may borrow funds. The Japanese Revolving Credit Facility, established in April 2023 and amended in January 2024 and April 2024, includes covenants that are substantially the same as those included in the Revolving Credit Facility. Under the terms of the January 2024 amendment, the Company agreed to provide collateral for its obligations under the Japanese Yen Revolving Credit Facility. See Part II Item 8 of Alcoa Corporation’s Annual Report on Form 10-K in Note M to the Consolidated Financial Statements for the year ended December 31, 2024 for more information on the Japanese Yen Revolving Credit Facility.

As of March 31, 2025, the Company was in compliance with all financial covenants. The Company may access the entire amount of commitments under the Japanese Revolving Credit Facility. There were no borrowings outstanding at March 31, 2025 and December 31, 2024. During the first quarter of 2025, no amounts were borrowed. During the first quarter of 2024, $201 (29,686 JPY) was borrowed and $196 (29,686 JPY) was repaid under the Japanese Yen Revolving Credit Facility.

In April 2025, the Company and ANHBV entered into an amendment to the Japanese Yen Revolving Credit Facility, reducing the aggregate commitments from $250 to $200 and extending maturity from April 2025 to April 2026.

Other

In April 2025, the Company amended a $74 term loan extending maturity from May 2025 to November 2025.

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Pension and Other Postretirement Benefits

3 Months Ended

Mar. 31, 2025

Retirement Benefits [Abstract]

Pension and Other Postretirement Benefits

L. Pension and Other Postretirement Benefits

The components of net periodic benefit cost were as follows:

	Pension benefits						Other postretirement benefits
First quarter ended March 31,	2025			2024			2025			2024
Service cost	$	2		$	2		$	—		$	1
Interest cost(1)		25			27			5			6
Expected return on plan assets(1)		(31	)		(35	)		—			—
Recognized net actuarial loss(1)		9			8			1			1
Amortization of prior service benefit(1)		—			—			(3	)		(3	)
Curtailments(2)		—			1			—			—
Net periodic benefit cost	$	5		$	3		$	3		$	5

(1)These amounts were reported in Other (income) expenses, net on the accompanying Statement of Consolidated Operations (see Note P).

(2)This amount was reported in Restructuring and other charges, net on the accompanying Statement of Consolidated Operations and Cash Flows.

Funding and Cash Flows. It is Alcoa’s policy to fund amounts for defined benefit pension plans sufficient to meet the minimum requirements set forth in each applicable country’s benefits laws and tax laws, including the Employee Retirement Income Security Act of 1974 (ERISA) for U.S. plans. From time to time, the Company contributes additional amounts as deemed appropriate.

Under ERISA regulations, a plan sponsor that establishes a pre-funding balance by making discretionary contributions to a U.S. defined benefit pension plan may elect to apply all or a portion of this balance toward its minimum required contribution obligations to the related plan in future years.

In the first quarter of 2025, management made such elections related to the Company’s U.S. plans and intends to do so for the remainder of 2025. As a result, Alcoa’s minimum required contribution to defined benefit pension plans in 2025 is estimated to be approximately $19, of which $12 was contributed to non-U.S. plans during the first quarter of 2025.

In the first quarter of 2024, $6 was contributed to non-U.S. plans.

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Derivatives and Other Financial Instruments

3 Months Ended

Mar. 31, 2025

Fair Value Disclosures [Abstract]

Derivatives and Other Financial Instruments

M. Derivatives and Other Financial Instruments

Fair Value

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy distinguishes between (i) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (ii) an entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below:

•Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

•Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

•Level 3 - Inputs that are both significant to the fair value measurement and unobservable.

Derivatives

Alcoa Corporation is exposed to certain risks relating to its ongoing business operations, including the risks of changing commodity prices, foreign currency exchange rates, and interest rates. Alcoa Corporation’s commodity and derivative activities include aluminum, energy, foreign exchange, and interest rate contracts, which are held for purposes other than trading. They are used to mitigate uncertainty and volatility, and to cover underlying exposures. While Alcoa does not generally enter into derivative contracts to mitigate the risk associated with changes in aluminum price, the Company may do so in isolated cases to address discrete commercial or operational conditions. Alcoa is not involved in trading activities for energy, weather derivatives, or other nonexchange commodities.

Alcoa Corporation’s commodity and derivative activities are subject to the management, direction, and control of the Strategic Risk Management Committee (SRMC), which consists of at least three members, including the chief executive officer, the chief financial officer, and the chief commercial officer. The remaining member(s) are other officers and/or employees of the Company as the chief executive officer may designate from time to time. The SRMC meets on a periodic basis to review derivative positions and strategy and reports to the Audit Committee of Alcoa Corporation’s Board of Directors on the scope of its activities.

During the first quarter of 2025, Alcoa entered into financial contracts with multiple counterparties to mitigate financial risks associated with changes in aluminum prices, natural gas prices, and foreign currency exchange rates. The aluminum and natural gas financial contracts qualify for cash flow hedge accounting. The foreign exchange financial contracts do not qualify for hedge accounting treatment. These contracts are held by a separate wholly-owned subsidiary of Alcoa Corporation and are intended to limit the Company’s net cash outlays to the committed funding under the San Ciprián joint venture agreement. The associated realized gains or losses have no impact on the results of the San Ciprián operations.

Alcoa Corporation’s aluminum, foreign exchange and natural gas contracts are classified as Level 1 under the fair value hierarchy. All of the Level 1 contracts are designated as either fair value or cash flow hedging instruments (except as described above). Alcoa Corporation also has several derivative instruments classified as Level 3 under the fair value hierarchy, which are either designated as cash flow hedges or undesignated. Alcoa included the changes in its equity method investee’s Level 2 derivatives in Accumulated other comprehensive loss through June 30, 2024, when the underlying contracts expired.

The following tables present the detail for Level 1 and 3 derivatives (see additional Level 3 information in further tables below):

	March 31, 2025				December 31, 2024
	Assets		Liabilities		Assets		Liabilities
Level 1 derivative instruments	$	19	$	12	$	1	$	20
Level 3 derivative instruments		30		1,096		24		1,079
Total	$	49	$	1,108	$	25	$	1,099
Less: Current		38		258		25		263
Noncurrent	$	11	$	850	$	—	$	836

	2025						2024
First quarter ended March 31,	Unrealized gain (loss) recognized in Other comprehensive income (loss)			Realized loss reclassified from Accumulated other comprehensive loss to earnings			Unrealized (loss) gain recognized in Other comprehensive income (loss)			Realized gain (loss) reclassified from Accumulated other comprehensive loss to earnings
Level 1 derivative instruments	$	24		$	(2	)	$	(3	)	$	4
Level 3 derivative instruments		(109	)		(93	)		120			(57	)
Total	$	(85	)	$	(95	)	$	117		$	(53	)

For the first quarters of 2025 and 2024, the realized loss of $2 and realized gain of $4, respectively, on Level 1 cash flow hedges were recognized in Sales.

The following table presents the outstanding quantities of derivative instruments classified as Level 1:

	Classification	March 31, 2025		March 31, 2024
Aluminum (in kmt)	Commodity buy forwards		173		101
Aluminum (in kmt)	Commodity sell forwards		458		44
Foreign currency (in millions of euro)	Foreign exchange buy forwards		163		79
Foreign currency (in millions of euro)	Foreign exchange sell forwards		11		17
Foreign currency (in millions of euro) (undesignated)	Foreign exchange buy forwards		852		—
Foreign currency (in millions of Norwegian krone)	Foreign exchange buy forwards		20		102
Foreign currency (in millions of Brazilian real)	Foreign exchange buy forwards		160		450
Foreign currency (in millions of Australian dollars)	Foreign exchange buy forwards		41		—
Foreign currency (in millions of Canadian dollar)	Foreign exchange buy forwards		—		26
Natural gas (in millions of megawatt hours)	Commodity buy forwards		2		—

Alcoa Corporation routinely uses Level 1 aluminum derivative instruments to manage exposures to changes in the fair value of firm commitments for the purchases or sales of aluminum. Additionally, Alcoa uses aluminum derivative instruments to manage LME exposures related to profitability improvement actions (expires December 2025) and the San Ciprián smelter (see above) (expires December 2027).

Alcoa Corporation uses Level 1 foreign exchange forward contracts to mitigate the risk of foreign exchange exposure related to euro power purchases in Norway (expires March 2028), U.S. dollar aluminum sales in Norway (expires June 2025), U.S. dollar alumina and aluminum sales in Brazil (expires October 2026), U.S. dollar alumina sales in Australia (expires December 2026) and euro expenses (primarily energy and labor) (expires December 2027). Additionally, Alcoa used Level 1 foreign exchange forward contracts to mitigate the risk of foreign exchange exposure related to Canadian dollar expenses in Canada (expired March 2025).

Alcoa Corporation uses Level 1 natural gas derivative instruments to mitigate the risk of price fluctuations on natural gas purchases in Spain (expires December 2027).

Additional Level 3 Disclosures

The following table presents quantitative information related to the significant unobservable inputs described above for Level 3 derivative instruments (megawatt hours in MWh):

	March 31, 2025		Unobservable Input	Unobservable Input Range
Asset Derivatives
Financial contract (undesignated)	$	30	Interrelationship of forward energy price, LME forward price and the Consumer Price Index	Electricity (per MWh)	2025: $31.92 2025: $60.48
				LME (per mt)	2025: $2,516
					2025: $2,547
Power contract		—	MWh of energy needed to produce the forecasted mt of aluminum	LME (per mt)	2025: $2,516 2025: $2,530
				Midwest premium (per pound)	2025: $0.5200 2025: $0.5200
				Electricity	Rate of 2 million MWh per year
Total Asset Derivatives	$	30
Liability Derivatives
Power contract	$	135	MWh of energy needed to produce the forecasted mt of aluminum	LME (per mt)	2025: $2,516 2027: $2,624
				Electricity	Rate of 4 million MWh per year
Power contracts		958	MWh of energy needed to produce the forecasted mt of aluminum	LME (per mt)	2025: $2,516 2029: $2,701 2036: $2,888
				Midwest premium (per pound)	2025: $0.5200 2029: $0.5200 2036: $0.5200
				Electricity	Rate of 18 million MWh per year
Power contract (undesignated)		3	Estimated spread between the 30-year debt yield of Alcoa and the counterparty	Credit spread	1.35%: 30-year debt yield spread 6.70%: Alcoa (estimated) 5.35%: counterparty
Total Liability Derivatives	$	1,096

The fair values of Level 3 derivative instruments recorded in the accompanying Consolidated Balance Sheet were as follows:

Asset Derivatives	March 31, 2025		December 31, 2024
Derivatives not designated as hedging instruments:
Current—financial contract	$	30	$	24
Total derivatives not designated as hedging instruments	$	30	$	24
Total Asset Derivatives	$	30	$	24
Liability Derivatives
Derivatives designated as hedging instruments:
Current—power contracts	$	249	$	251
Noncurrent—power contracts		844		826
Total derivatives designated as hedging instruments	$	1,093	$	1,077
Derivatives not designated as hedging instruments:
Current—embedded credit derivative	$	1	$	1
Noncurrent—embedded credit derivative		2		1
Total derivatives not designated as hedging instruments	$	3	$	2
Total Liability Derivatives	$	1,096	$	1,079

Assuming market rates remain constant with the rates at March 31, 2025, a realized loss of $249 related to power contracts is expected to be recognized in Sales over the next 12 months.

At March 31, 2025 and December 31, 2024, the power contracts with embedded derivatives designated as cash flow hedges include hedges of forecasted aluminum sales of 1,175 kmt and 1,230 kmt, respectively.

The following tables present the reconciliation of activity for Level 3 derivative instruments:

	Assets
First quarter ended March 31, 2025	Financial contracts
January 1, 2025	$	24
Total gains or losses included in:
Other income, net (unrealized/realized)		8
Settlements and other		(2	)
March 31, 2025	$	30
Change in unrealized gains or losses included in earnings    for derivative instruments held at March 31, 2025:
Other income, net	$	8

	Liabilities
First quarter ended March 31, 2025	Power contracts			Embedded credit derivative
January 1, 2025	$	1,077		$	2
Total gains or losses included in:
Sales (realized)		(93	)		—
Other expenses, net (unrealized/realized)		—			1
Other comprehensive loss (unrealized)		109			—
March 31, 2025	$	1,093		$	3
Change in unrealized gains or losses included in earnings    for derivative instruments held at March 31, 2025:
Other expenses, net	$	—		$	1

There were no purchases, sales, or settlements of Level 3 derivative instruments in the periods presented.

Other Financial Instruments

The carrying values and fair values of Alcoa Corporation’s other financial instruments were as follows:

	March 31, 2025				December 31, 2024
	Carrying value		Fair value		Carrying value		Fair value
Cash and cash equivalents	$	1,202	$	1,202	$	1,138	$	1,138
Restricted cash		88		88		96		96
Short-term borrowings		45		45		50		50
Long-term debt due within one year		75		75		75		75
Long-term debt, less amount due within one year		2,573		2,594		2,470		2,499

The following methods were used to estimate the fair values of other financial instruments:

Cash and cash equivalents and Restricted cash. The carrying amounts approximate fair value because of the short maturity of the instruments. The fair value amounts for Cash and cash equivalents and Restricted cash were classified in Level 1 of the fair value hierarchy.

Short-term borrowings and Long-term debt, including amounts due within one year. The fair value of Long-term debt, less amounts due within one year was based on quoted market prices for public debt and on interest rates that are currently available to Alcoa Corporation for issuance of debt with similar terms and maturities for non-public debt. The fair value amounts for all Short-term borrowings and Long-term debt were classified in Level 2 of the fair value hierarchy.

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Income Taxes

3 Months Ended

Mar. 31, 2025

Income Tax Disclosure [Abstract]

Income Taxes

N. Income Taxes – Alcoa Corporation’s estimated annualized effective tax rate (AETR) for 2025 as of March 31, 2025 differs from the U.S. federal statutory rate of 21% primarily due to income in certain jurisdictions with full valuation allowances resulting in no incremental tax expense. In addition, income in foreign jurisdictions with higher statutory tax rates contribute to the variance from 21%.

	First quarter ended March 31,
	2025				2024
Income (loss) before income taxes	$	668			$	(325	)
Estimated annualized effective tax rate		19.3		%		(8.9	)	%
Income tax expense	$	129			$	29
Favorable tax impact related to losses in jurisdictions with no tax benefit		(11	)			(47	)
Discrete tax expense		2				—
Provision for (benefit from) income taxes	$	120			$	(18	)

The Inflation Reduction Act of 2022 (IRA) contains a number of tax credits and other incentives for investments in renewable energy production, carbon capture, and other climate-related actions, as well as the production of critical minerals. In December 2023, the U.S. Treasury issued guidance on Section 45X of the Advanced Manufacturing Tax Credit. The Notice of Proposed Rulemaking (the Proposed Regulations) clarified that commercial grade aluminum is included in the definition of aluminum eligible for the credit, which was designed to incentivize domestic production of critical materials important for the transition to clean energy.

On October 24, 2024, the U.S. Treasury finalized the Proposed Regulations under Section 45X with important modifications including the ability to include the cost of certain direct and indirect materials in the cost base of the credit. The Proposed Regulation on the definition of aluminum was not finalized; however, management believes that commercial grade aluminum continues to qualify for the Section 45X credit. In the Preamble to the Final Regulations, the U.S. Treasury indicated it will finalize the definition at a later date.

In the first quarters of 2025 and 2024, the Company recorded benefits of $14 and $9 in Cost of goods sold, respectively, related to its Massena West smelter (New York) and its Warrick smelter (Indiana). As of March 31, 2025, benefits of $36 were included in Other receivables and $85 were included in Other noncurrent assets on the Consolidated Balance Sheet. As of December 31, 2024, benefits of $36 were included in Other receivables and $71 were included in Other noncurrent assets on the Consolidated Balance Sheet.

ANHBV has a full valuation allowance recorded against deferred tax assets, which was established in 2016, as the Company believes it is more likely than not that these tax benefits will not be realized. The majority of ANHBV’s net deferred tax assets relate to prior net operating losses and interest expense; the loss carryforwards are not subject to an expiration period. If ANHBV continues to demonstrate sustained profitability, management may conclude that ANHBV’s deferred tax assets may be realized, resulting in a future reversal of the valuation allowance, generating a non-cash benefit in the period recorded. ANHBV’s net deferred tax assets, excluding the valuation allowance, were $248 as of March 31, 2025.

Alcoa World Alumina Brasil Ltda. (AWAB) has a full valuation allowance recorded against deferred tax assets, which was established in 2023, as the Company believes it is more likely than not that these tax benefits will not be realized. The majority of AWAB’s net deferred tax assets relate to prior net operating losses; the loss carryforwards are not subject to an expiration period. If AWAB continues to demonstrate sustained profitability, management may conclude that AWAB’s deferred tax assets may be realized, resulting in a future reversal of the valuation allowance, generating a non-cash benefit in the period recorded. AWAB’s net deferred tax assets, excluding the valuation allowance, were $109 as of March 31, 2025.

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Contingencies

3 Months Ended

Mar. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

Contingencies

O. Contingencies

Environmental Matters

Alcoa Corporation participates in environmental assessments and cleanups at several locations. These include currently or previously owned or operated facilities and adjoining properties, and waste sites, including Superfund (Comprehensive Environmental Response, Compensation and Liability Act (CERCLA)) sites.

Alcoa Corporation’s environmental remediation reserve balance reflects the most probable costs to remediate identified environmental conditions for which costs can be reasonably estimated. The following table details the changes in the carrying value of recorded environmental remediation reserves:

Balance at December 31, 2023	$	268
Liabilities incurred		25
Cash payments		(49	)
Reversals of previously recorded liabilities		(12	)
Foreign currency translation and other		(12	)
Balance at December 31, 2024		220
Cash payments		(8	)
Foreign currency translation and other		1
Balance at March 31, 2025	$	213

At March 31, 2025 and December 31, 2024, the current portion of the environmental remediation reserve balance was $44 and $38, respectively.

Payments related to remediation expenses applied against the reserve were $8 and $6 in the first quarters of 2025 and 2024, respectively. These amounts include mandated expenditures as well as those not required by any regulatory authority or third party.

The estimated timing of cash outflows from the environmental remediation reserve at March 31, 2025 was as follows:

2025 (excluding the three months ended March 31, 2025)	$	35
2026 – 2030		83
Thereafter		95
Total	$	213

Reserve balances at March 31, 2025 and December 31, 2024, associated with significant sites with active remediation underway or for future remediation were $151 and $154, respectively. In management’s judgment, the Company’s reserves are sufficient to satisfy the provisions of the respective action plans. Upon changes in facts or circumstances, a change to the reserve may be required. The Company’s significant sites include:

Suriname—The reserve associated with the 2017 closure of the Suralco refinery and bauxite mine is for treatment and disposal of refinery waste and soil remediation. The work began in 2017 and is expected to be completed at the end of 2029.

Hurricane Creek, Arkansas—The reserve associated with the 1990 closure of two mining areas and refineries near Hurricane Creek, Arkansas is for ongoing monitoring and maintenance for water quality surrounding the mine areas and residue disposal areas.

Massena, New York—The reserve associated with the 2015 closure of the Massena East smelter by the Company’s subsidiary, Reynolds Metals Company, is for subsurface soil remediation to be performed after demolition of the structures. Remediation work commenced in 2021 and will take up to eight years to complete.

Point Comfort, Texas—The reserve associated with the 2019 closure of the Point Comfort alumina refinery is for disposal of industrial wastes contained at the site, subsurface remediation, and post-closure monitoring and maintenance. The final remediation plan is currently being developed, which may result in a change to the existing reserve.

Addy, Washington—The reserve associated with the 2022 closure of the Addy magnesium smelter facility is for site-wide remediation and investigation and post-closure monitoring and maintenance. Remediation work is not expected to begin until 2027 and will take three to five years to complete. The final remediation plan is currently being developed, which may result in a change to the existing reserve.

Ferndale, Washington—The reserve associated with the 2023 closure of the Intalco aluminum smelter in Ferndale, Washington is for below grade site remediation and five years of post-closure maintenance and monitoring. The final remediation plan is under review.

Other Sites—The Company is in the process of decommissioning various other plants and remediating sites in several countries for potential redevelopment or to return the land to a natural state. In aggregate, there are remediation projects at 31 other sites that are planned or underway. These activities will be completed at various times in the future over the next two to four years, after which ongoing monitoring and other activities may be required. At March 31, 2025 and December 31, 2024, the reserve balance associated with these activities was $62 and $66, respectively.

Tax

Brazil (AWAB)—Under Brazilian law, taxpayers who generate non-cumulative federal value added tax credits related to exempt exports may either request a refund in cash (monetization) or offset them against other federal taxes owed. In 2012, AWAB requested monetization of $136 (R$273) from the Brazilian Federal Revenue Office (RFB) and received $68 (R$136) that year. In March 2013, AWAB was notified by the RFB that approximately $110 (R$220) of value added tax credits previously claimed were being disallowed and a penalty of 50% was assessed. $41 (R$82) of the cash received in 2012 related to the disallowed amount. The value added tax credits were claimed by AWAB for both fixed assets and export sales related to the Juruti bauxite mine and Alumar refinery expansion for tax years 2009 through 2011. The RFB has disallowed credits they allege belong to the consortium in which AWAB owns an interest and should not have been claimed by AWAB. Credits have also been disallowed as a result of challenges to apportionment methods used, questions about the use of the credits, and an alleged lack of documented proof. AWAB presented defense of its claim to the RFB on April 8, 2013.

In February 2022, the RFB notified AWAB that it had inspected the value added tax credits claimed for 2012 and disallowed $4 (R$19). In its decision, the RFB allowed credits of $14 (R$65) that were similar to those previously disallowed for 2009 through 2011. In July 2022, the RFB notified AWAB that it had inspected the value added tax credits claimed for 2013 and disallowed $13 (R$66). In its decision, the RFB allowed credits of $10 (R$53) that were similar to those previously disallowed for 2009 through 2011. In September 2024, the RFB notified AWAB that it had further inspected the value added tax credits claimed for 2013 and issued a first administrative decision allowing additional credits of $1 (R$5) that were similar to those previously disallowed for 2009 through 2011. AWAB received the 2012 allowed credits with interest of $9 (R$44) in March 2022, the 2013 allowed credits with interest of $6 (R$31) in August 2022, and the additional 2013 allowed credits with interest of $1 (R$6) in December 2024. The decisions on the 2012 and 2013 credits provide positive evidence to support management’s opinion that there is no basis for these credits to be disallowed. AWAB will continue to dispute the credits that were disallowed for 2012 and 2013. If AWAB is successful in this administrative process, the RFB would have no further recourse. If unsuccessful in this process, AWAB has the option to litigate at a judicial level. Separately from AWAB’s administrative appeal, in June 2015, a new tax law was enacted repealing the provisions in the tax code that were the basis for the RFB assessing a 50% penalty in this matter. As such, the estimated range of reasonably possible loss for these matters is $0 to $52 (R$300). It is management’s opinion that the allegations have no basis; however, at this time, the Company is unable to reasonably predict an outcome for this matter.

Australia (AofA)—On April 30, 2025, the Administrative Review Tribunal of Australia (ART) issued its decision related to the proceedings Alcoa of Australia Limited (AofA) filed against the Australian Taxation Office (ATO) in April 2022 to contest the Notices of Assessment (the Notices) issued by the ATO in July 2020 (described below) related to transfer pricing of certain historic third-party alumina sales. The ART decided that no additional tax is owed, consistent with Alcoa’s long-held position related to this matter.

The Notices asserted claims for income tax payable by AofA of approximately $135 (A$214) and claims for compounded interest on the tax amount totaling approximately $445 (A$707). In addition to the Notices, the ATO issued a position paper in September 2020 with its preliminary view on the imposition of administrative penalties related to the tax assessment which proposed penalties of approximately $81 (A$128). During 2020, AofA lodged formal objections to the Notices, provided a submission on the ATO’s imposition of interest, and submitted a response to the ATO’s position paper on penalties. AofA has not received a response to its submission on the ATO’s imposition of interest or its response to the ATO’s position paper on penalties.

In accordance with the ATO’s dispute resolution practices, AofA paid 50% of the assessed income tax amount exclusive of interest and any penalties, or approximately $74 (A$107), during the third quarter 2020. AofA funded the payment with cash on hand and recorded the payment within Other noncurrent assets as a noncurrent prepaid tax asset; at March 31, 2025, the related balance was $67 (A$107).

Interest on the unpaid tax was accrued through March 31, 2025, which, along with the initial interest assessment, was deductible against taxable income by AofA. Beginning in the third quarter of 2020, AofA applied this deduction and total reductions in cash tax payments of $216 (A$343) and $206 (A$332) were reflected within Other noncurrent liabilities and deferred credits as a noncurrent accrued tax liability at March 31, 2025 and December 31, 2024, respectively.

The ATO has 28 days to appeal the ART’s decision. Should the ATO choose not to appeal, the disputed tax claims (and additional related interest and penalties) will be withdrawn. With a withdrawal of the ATO’s claims, the prepaid tax asset of $67 (A$107) would be expected to be refunded to AofA in June 2025, and accrued cash taxes of $216 (A$343) related to the interest deductions would be payable by AofA by June 1, 2026. The net cash impact of both the refunded amount and the accrued cash taxes would be approximately $149 (A$236) through June 2026.

The Company maintains that the sales that were subject to the ATO’s review, which were ultimately sold to Aluminium Bahrain B.S.C., were the result of arm’s length transactions by AofA over two decades and were made at arm’s length prices consistent with the prices paid by other third-party alumina customers. The Company continues to believe it is more likely than not that AofA’s tax position will be sustained in the event of an appeal by the ATO.

References to any assessed U.S. dollar amounts presented in connection with this matter have been converted into U.S. dollars from Australian dollars based on the exchange rate in the respective period.

General

In addition to the matters discussed above, various other lawsuits, claims, and proceedings have been or may be instituted or asserted against Alcoa Corporation, including those pertaining to environmental, safety and health, commercial, tax, product liability, intellectual property infringement, governance, employment, and employee and retiree benefit matters, and other actions and claims arising out of the normal course of business. While the amounts claimed in these other matters may be substantial, the ultimate liability is not readily determinable because of the considerable uncertainties that exist. Accordingly, it is possible that the Company’s liquidity or results of operations in a particular period could be materially affected by one or more of these other matters. However, based on facts currently available, management believes that the disposition of these other matters that are pending or asserted will not have a material adverse effect, individually or in the aggregate, on the financial position of the Company.

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Other Financial Information

3 Months Ended

Mar. 31, 2025

Other Financial Information [Abstract]

Other Financial Information

P. Other Financial Information

Other (Income) Expenses, Net

	First quarter ended March 31,
	2025			2024
Equity loss	$	6		$	27
Foreign currency (gains) losses, net		(17	)		24
Net loss from asset sales		3			11
Net (gain) loss on mark-to-market derivative instruments		(7	)		5
Non-service costs – pension and other postretirement benefits		6			4
Other, net		(17	)		(12	)
	$	(26	)	$	59

Other Noncurrent Assets

	March 31, 2025		December 31, 2024
Prepaid gas transmission contract	$	285	$	278
Gas supply prepayment		220		225
Value added tax credits		211		213
Deferred mining costs, net		196		184
Goodwill		143		142
Prepaid pension benefit		131		128
IRA Section 45X credit		85		71
Noncurrent restricted cash		68		53
Noncurrent prepaid tax asset		67		66
Intangibles, net		35		36
Other		101		101
	$	1,542	$	1,497

Cash and Cash Equivalents and Restricted Cash

	March 31, 2025		December 31, 2024
Cash and cash equivalents	$	1,202	$	1,138
Current restricted cash		20		43
Noncurrent restricted cash		68		53
	$	1,290	$	1,234

Restricted cash primarily relates to commitments included in the viability agreement reached with the workers’ representatives of the San Ciprián smelter in December 2021, and subsequently updated in February 2023. $11 was released from restricted cash in the first quarter of 2025, related to smelter restart and capital expenditures incurred in the fourth quarter of 2024 and first quarter of 2025. At March 31, 2025, the Company had restricted cash of $75 available for capital improvements at the site and smelter restart costs.

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Supplier Finance Programs

3 Months Ended

Mar. 31, 2025

Supplier Finance Programs [Abstract]

Supplier Finance Programs

Q. Supplier Finance Programs

The Company has various supplier finance programs with third-party financial institutions that are made available to suppliers to facilitate payment term negotiations. Under the terms of these agreements, participating suppliers receive payment in advance of the payment date from third-party financial institutions for qualifying invoices. Alcoa’s obligations to its suppliers, including amounts due and payment terms, are not impacted by its suppliers’ participation in these programs. The Company does not pledge any assets as security or provide any guarantees beyond payment of outstanding invoices at maturity under these arrangements. The Company does not pay fees to the financial institutions under these arrangements. At March 31, 2025 and December 31, 2024, qualifying supplier invoices outstanding under these programs were $97 and $94, respectively, and have payment terms ranging from 50 to 110 days. These obligations are included in Accounts payable, trade on the accompanying Consolidated Balance Sheet.

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Subsequent Events

3 Months Ended

Mar. 31, 2025

Subsequent Events [Abstract]

Subsequent Events

R. Subsequent Events

On April 28, 2025, Alcoa’s San Ciprián complex was impacted by the widespread power outage across Spain. As a result of the outage, both the refinery and smelter at the complex were affected. Due to the preliminary nature of the information, Alcoa is unable to reasonably estimate the impact to the Company’s results of operations until a thorough assessment is complete.

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Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

A. Basis of Presentation – The interim Consolidated Financial Statements of Alcoa Corporation and its subsidiaries (Alcoa Corporation, Alcoa, or the Company) 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 Quarterly Report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, which includes disclosures required by GAAP.

In accordance with GAAP, certain situations require management to make estimates based on judgments and assumptions, which may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements. They also may affect the reported amounts of revenues and expenses during the reporting periods. Management uses historical experience and all available information to make these estimates. Management regularly evaluates the judgments and assumptions used in its estimates, and results could differ from those estimates upon future events and their effects or new information.

Principles of Consolidation

Principles of Consolidation. The Consolidated Financial Statements of the Company include the accounts of Alcoa Corporation and companies in which Alcoa Corporation has a controlling interest, including those that comprise the San Ciprián joint venture (see Note C). Intercompany transactions have been eliminated. The equity method of accounting is used for investments in affiliates and other joint ventures over which the Company has significant influence but does not have effective control. Investments in affiliates in which Alcoa Corporation cannot exercise significant influence are accounted for at cost less any impairment, a measurement alternative in accordance with GAAP.

Prior to Alcoa’s acquisition of Alumina Limited on August 1, 2024 (see Note C), Alcoa consolidated its 60% ownership in the entities comprising the Alcoa World Alumina & Chemicals (AWAC) joint venture and Alumina Limited’s interest in the equity of such entities was reflected as Noncontrolling interest within Equity on the accompanying Consolidated Balance Sheet.

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Restructuring and Other Charges, Net (Tables)

3 Months Ended

Mar. 31, 2025

Restructuring and Related Activities [Abstract]

Schedule of Restructuring and Other Charges, Net by Reportable Segments, Pretax

Alcoa Corporation does not include Restructuring and other charges, net in the results of its reportable segments. The impact of allocating such charges to segment results would have been as follows:

	First quarter ended March 31,
	2025		2024
Alumina	$	—	$	197
Aluminum		3		—
Segment total		3		197
Corporate		2		5
Total Restructuring and other charges, net	$	5	$	202

Activity and Reserve Balances for Restructuring Charges

Activity and reserve balances for restructuring charges were as follows:

	Severance and employee termination costs			Other costs			Total
Balance at December 31, 2023	$	6		$	57		$	63
Restructuring and other charges, net		44			264			308
Cash payments		(38	)		(145	)		(183	)
Reversals and other		1			(8	)		(7	)
Balance at December 31, 2024		13			168			181
Restructuring and other charges, net		—			5			5
Cash payments		(1	)		(48	)		(49	)
Reversals and other		(1	)		4			3
Balance at March 31, 2025	$	11		$	129		$	140

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Schedule of Operating Results, Capital Expenditures and Assets of Alcoa's Reportable Segments

The operating results, capital expenditures, and assets of Alcoa Corporation’s reportable segments were as follows (differences between segment totals and consolidated amounts are in Corporate):

	Alumina			Aluminum			Total
First quarter ended March 31, 2025
Sales:
Third-party sales	$	1,463		$	1,901		$	3,364
Intersegment sales		712			4			716
Total sales	$	2,175		$	1,905		$	4,080
Adjusted operating costs(1)		723			1,574			2,297
Other segment items(2)		788			197			985
Segment Adjusted EBITDA	$	664		$	134		$	798
Supplemental information:
Depreciation, depletion, and amortization	$	76		$	67		$	143
Equity income (loss)		15			(6	)		9
Capital expenditures		53			37			90
First quarter ended March 31, 2024
Sales:
Third-party sales	$	961		$	1,638		$	2,599
Intersegment sales		395			4			399
Total sales	$	1,356		$	1,642		$	2,998
Adjusted operating costs(1)		796			1,279			2,075
Other segment items(2)		421			313			734
Segment Adjusted EBITDA	$	139		$	50		$	189
Supplemental information:
Depreciation, depletion, and amortization	$	87		$	68		$	155
Equity (loss) income		(11	)		2			(9	)
Capital expenditures		57			41			98
March 31, 2025
Assets:
Equity investments	$	443		$	553		$	996
Segment assets		6,295			6,269			12,564
December 31, 2024
Assets:
Equity investments	$	420		$	546		$	966
Segment assets		6,138			6,129			12,267

(1)Adjusted operating costs include all production related costs for alumina or aluminum produced and shipped: raw materials consumed; conversion costs, such as labor, materials, and utilities; and plant administrative expenses.

(2)Other segment items include costs associated with trading activity, the Alumina segment’s purchase of bauxite from offtake or other supply agreements, the Alumina segment’s commercial shipping services, and the Aluminum segment’s energy assets; other direct and non-production related charges; Selling, general administrative, and other expenses; and Research and development expenses.

Schedule of Segment Adjusted EBITDA to Consolidated Net Income (Loss) Attributable to Alcoa Corporation

The following table reconciles Total Segment Adjusted EBITDA to Consolidated net income (loss) attributable to Alcoa Corporation:

	First quarter ended March 31,
	2025			2024
Total Segment Adjusted EBITDA	$	798		$	189
Unallocated amounts:
Transformation(1)		(12	)		(14	)
Intersegment eliminations		103			(8	)
Corporate expenses(2)		(37	)		(34	)
Provision for depreciation, depletion, and amortization		(148	)		(161	)
Restructuring and other charges, net (D)		(5	)		(202	)
Interest expense		(53	)		(27	)
Other income (expenses), net (P)		26			(59	)
Other(3)		(4	)		(9	)
Consolidated income (loss) before income taxes		668			(325	)
(Provision for) benefit from income taxes		(120	)		18
Net loss attributable to noncontrolling interest		—			55
Consolidated net income (loss) attributable to Alcoa Corporation	$	548		$	(252	)

(1)Transformation includes, among other items, the Adjusted EBITDA of previously closed operations.

(2)Corporate expenses are composed of general administrative and other expenses of operating the corporate headquarters and other global administrative facilities, as well as research and development expenses of the corporate technical center.

(3)Other includes certain items that are not included in the Adjusted EBITDA of the reportable segments.

Schedule of Sales by Product Division

The following table details Alcoa Corporation’s Sales by product division:

	First quarter ended March 31,
	2025			2024
Aluminum	$	1,955		$	1,661
Alumina		1,211			890
Bauxite		242			61
Energy		33			33
Other(1)		(72	)		(46	)
	$	3,369		$	2,599

(1)Other includes realized gains and losses related to embedded derivative instruments designated as cash flow hedges of forward sales of aluminum (see Note M).

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2025

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted EPS Attributable to Alcoa Corporation Common Shareholders

The share information used to compute basic and diluted EPS attributable to Alcoa Corporation common shareholders was as follows (shares in millions):

	First quarter ended March 31,
	2025		2024
Average shares outstanding – basic		259		179
Effect of dilutive securities:
Stock options		—		—
Stock units		1		—
Average shares outstanding – diluted		260		179

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Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2025

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Summary of Changes in Accumulated Other Comprehensive (Loss) Income by Component

The following table details the activity of the three components that comprise Accumulated other comprehensive loss for Alcoa Corporation’s shareholders and Noncontrolling interest:

	Alcoa Corporation						Noncontrolling interest
	First quarter ended March 31,						First quarter ended March 31,
	2025			2024			2025		2024
Pension and other postretirement benefits (L)
Balance at beginning of period	$	(11	)	$	—		$	—	$	(15	)
Other comprehensive (loss) income:
Unrecognized net actuarial gain/loss and    prior service cost/benefit		(1	)		4			—		—
Tax expense(2)		(1	)		(1	)		—		—
Total Other comprehensive (loss) income    before reclassifications, net of tax		(2	)		3			—		—
Amortization of net actuarial gain/loss and    prior service cost/benefit(1)		7			6			—		1
Total amount reclassified from Accumulated    other comprehensive loss, net of tax(4)		7			6			—		1
Total Other comprehensive income		5			9			—		1
Balance at end of period	$	(6	)	$	9		$	—	$	(14	)
Foreign currency translation
Balance at beginning of period	$	(4,194	)	$	(2,593	)	$	—	$	(983	)
Other comprehensive income (loss)		185			(122	)		—		(54	)
Joint venture formation (C)		(31	)		—			—		—
Balance at end of period	$	(4,040	)	$	(2,715	)	$	—	$	(1,037	)
Cash flow hedges (M)
Balance at beginning of period	$	(905	)	$	(1,052	)	$	—	$	—
Other comprehensive (loss) income:
Net change from periodic revaluations		(85	)		117			—		—
Tax benefit (expense)(2)		23			(31	)		—		—
Total Other comprehensive (loss) income    before reclassifications, net of tax		(62	)		86			—		—
Net amount reclassified to earnings:
Aluminum contracts(3)		93			57			—		—
Foreign exchange contracts(3)		2			(4	)		—		—
Sub-total		95			53			—		—
Tax expense(2)		(17	)		(9	)		—		—
Total amount reclassified from Accumulated    other comprehensive loss, net of tax(4)		78			44			—		—
Total Other comprehensive income		16			130			—		—
Balance at end of period	$	(889	)	$	(922	)	$	—	$	—
Total Accumulated other comprehensive loss	$	(4,935	)	$	(3,628	)	$	—	$	(1,051	)

(1)These amounts were included in the computation of net periodic benefit cost for pension and other postretirement benefits (see Note L).

(2)These amounts were reported in Provision for income taxes on the accompanying Statement of Consolidated Operations.

(3)These amounts were reported in Sales on the accompanying Statement of Consolidated Operations.

(4)A positive amount indicates a corresponding charge to earnings and a negative amount indicates a corresponding benefit to earnings.

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Investments (Tables)

3 Months Ended

Mar. 31, 2025

Equity Method Investments and Joint Ventures [Abstract]

Summary of Unaudited Financial Information for Alcoa Corporation's Equity Investments

A summary of unaudited financial information for Alcoa Corporation’s equity investments is as follows (amounts represent 100% of investee financial information):

First quarter ended March 31, 2025	Saudi Arabia Joint Venture			Mining			Energy			Other
Sales	$	956		$	168		$	58		$	111
Cost of goods sold		775			104			22			100
Net income (loss)		13			19			29			(10	)
Equity in net income (loss) of affiliated companies,    before reconciling adjustments		3			9			11			(5	)
Other		6			—			—			(7	)
Alcoa Corporation’s equity in net income (loss) of    affiliated companies		9			9			11			(12	)
First quarter ended March 31, 2024
Sales	$	711		$	115		$	63		$	115
Cost of goods sold		599			103			25			105
Net (loss) income		(8	)		(5	)		31			(16	)
Equity in net (loss) income of affiliated companies,    before reconciling adjustments		(2	)		(2	)		12			(8	)
Other		(8	)		—			(1	)		(5	)
Alcoa Corporation’s equity in net (loss) income of    affiliated companies		(10	)		(2	)		11			(13	)

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Inventories (Tables)

3 Months Ended

Mar. 31, 2025

Inventory Disclosure [Abstract]

Schedule of Inventory Components

	March 31, 2025		December 31, 2024
Finished goods	$	414	$	406
Work-in-process		276		251
Bauxite and alumina		657		551
Purchased raw materials		589		546
Operating supplies		246		244
	$	2,182	$	1,998

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Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2025

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost were as follows:

	Pension benefits						Other postretirement benefits
First quarter ended March 31,	2025			2024			2025			2024
Service cost	$	2		$	2		$	—		$	1
Interest cost(1)		25			27			5			6
Expected return on plan assets(1)		(31	)		(35	)		—			—
Recognized net actuarial loss(1)		9			8			1			1
Amortization of prior service benefit(1)		—			—			(3	)		(3	)
Curtailments(2)		—			1			—			—
Net periodic benefit cost	$	5		$	3		$	3		$	5

(1)These amounts were reported in Other (income) expenses, net on the accompanying Statement of Consolidated Operations (see Note P).

(2)This amount was reported in Restructuring and other charges, net on the accompanying Statement of Consolidated Operations and Cash Flows.

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Derivatives and Other Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2025

Fair Value Disclosures [Abstract]

Schedule of Detail for Level 1 and 3 Derivatives

The following tables present the detail for Level 1 and 3 derivatives (see additional Level 3 information in further tables below):

	March 31, 2025				December 31, 2024
	Assets		Liabilities		Assets		Liabilities
Level 1 derivative instruments	$	19	$	12	$	1	$	20
Level 3 derivative instruments		30		1,096		24		1,079
Total	$	49	$	1,108	$	25	$	1,099
Less: Current		38		258		25		263
Noncurrent	$	11	$	850	$	—	$	836

	2025						2024
First quarter ended March 31,	Unrealized gain (loss) recognized in Other comprehensive income (loss)			Realized loss reclassified from Accumulated other comprehensive loss to earnings			Unrealized (loss) gain recognized in Other comprehensive income (loss)			Realized gain (loss) reclassified from Accumulated other comprehensive loss to earnings
Level 1 derivative instruments	$	24		$	(2	)	$	(3	)	$	4
Level 3 derivative instruments		(109	)		(93	)		120			(57	)
Total	$	(85	)	$	(95	)	$	117		$	(53	)

Schedule of Outstanding Quantities of Derivative Instruments

The following table presents the outstanding quantities of derivative instruments classified as Level 1:

	Classification	March 31, 2025		March 31, 2024
Aluminum (in kmt)	Commodity buy forwards		173		101
Aluminum (in kmt)	Commodity sell forwards		458		44
Foreign currency (in millions of euro)	Foreign exchange buy forwards		163		79
Foreign currency (in millions of euro)	Foreign exchange sell forwards		11		17
Foreign currency (in millions of euro) (undesignated)	Foreign exchange buy forwards		852		—
Foreign currency (in millions of Norwegian krone)	Foreign exchange buy forwards		20		102
Foreign currency (in millions of Brazilian real)	Foreign exchange buy forwards		160		450
Foreign currency (in millions of Australian dollars)	Foreign exchange buy forwards		41		—
Foreign currency (in millions of Canadian dollar)	Foreign exchange buy forwards		—		26
Natural gas (in millions of megawatt hours)	Commodity buy forwards		2		—

Schedule of Quantitative Information for Level 3 Derivative Contracts

The following table presents quantitative information related to the significant unobservable inputs described above for Level 3 derivative instruments (megawatt hours in MWh):

	March 31, 2025		Unobservable Input	Unobservable Input Range
Asset Derivatives
Financial contract (undesignated)	$	30	Interrelationship of forward energy price, LME forward price and the Consumer Price Index	Electricity (per MWh)	2025: $31.92 2025: $60.48
				LME (per mt)	2025: $2,516
					2025: $2,547
Power contract		—	MWh of energy needed to produce the forecasted mt of aluminum	LME (per mt)	2025: $2,516 2025: $2,530
				Midwest premium (per pound)	2025: $0.5200 2025: $0.5200
				Electricity	Rate of 2 million MWh per year
Total Asset Derivatives	$	30
Liability Derivatives
Power contract	$	135	MWh of energy needed to produce the forecasted mt of aluminum	LME (per mt)	2025: $2,516 2027: $2,624
				Electricity	Rate of 4 million MWh per year
Power contracts		958	MWh of energy needed to produce the forecasted mt of aluminum	LME (per mt)	2025: $2,516 2029: $2,701 2036: $2,888
				Midwest premium (per pound)	2025: $0.5200 2029: $0.5200 2036: $0.5200
				Electricity	Rate of 18 million MWh per year
Power contract (undesignated)		3	Estimated spread between the 30-year debt yield of Alcoa and the counterparty	Credit spread	1.35%: 30-year debt yield spread 6.70%: Alcoa (estimated) 5.35%: counterparty
Total Liability Derivatives	$	1,096

Schedule of Fair Values of Level 3 Derivative Instruments Recorded as Assets and Liabilities

The fair values of Level 3 derivative instruments recorded in the accompanying Consolidated Balance Sheet were as follows:

Asset Derivatives	March 31, 2025		December 31, 2024
Derivatives not designated as hedging instruments:
Current—financial contract	$	30	$	24
Total derivatives not designated as hedging instruments	$	30	$	24
Total Asset Derivatives	$	30	$	24
Liability Derivatives
Derivatives designated as hedging instruments:
Current—power contracts	$	249	$	251
Noncurrent—power contracts		844		826
Total derivatives designated as hedging instruments	$	1,093	$	1,077
Derivatives not designated as hedging instruments:
Current—embedded credit derivative	$	1	$	1
Noncurrent—embedded credit derivative		2		1
Total derivatives not designated as hedging instruments	$	3	$	2
Total Liability Derivatives	$	1,096	$	1,079

Schedule of Reconciliation of Activity for Derivative Contracts

The following tables present the reconciliation of activity for Level 3 derivative instruments:

	Assets
First quarter ended March 31, 2025	Financial contracts
January 1, 2025	$	24
Total gains or losses included in:
Other income, net (unrealized/realized)		8
Settlements and other		(2	)
March 31, 2025	$	30
Change in unrealized gains or losses included in earnings    for derivative instruments held at March 31, 2025:
Other income, net	$	8

	Liabilities
First quarter ended March 31, 2025	Power contracts			Embedded credit derivative
January 1, 2025	$	1,077		$	2
Total gains or losses included in:
Sales (realized)		(93	)		—
Other expenses, net (unrealized/realized)		—			1
Other comprehensive loss (unrealized)		109			—
March 31, 2025	$	1,093		$	3
Change in unrealized gains or losses included in earnings    for derivative instruments held at March 31, 2025:
Other expenses, net	$	—		$	1

Schedule of Carrying Values and Fair Values of Other Financial Instruments

The carrying values and fair values of Alcoa Corporation’s other financial instruments were as follows:

	March 31, 2025				December 31, 2024
	Carrying value		Fair value		Carrying value		Fair value
Cash and cash equivalents	$	1,202	$	1,202	$	1,138	$	1,138
Restricted cash		88		88		96		96
Short-term borrowings		45		45		50		50
Long-term debt due within one year		75		75		75		75
Long-term debt, less amount due within one year		2,573		2,594		2,470		2,499

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2025

Income Tax Disclosure [Abstract]

Schedule of Income Taxes

	First quarter ended March 31,
	2025				2024
Income (loss) before income taxes	$	668			$	(325	)
Estimated annualized effective tax rate		19.3		%		(8.9	)	%
Income tax expense	$	129			$	29
Favorable tax impact related to losses in jurisdictions with no tax benefit		(11	)			(47	)
Discrete tax expense		2				—
Provision for (benefit from) income taxes	$	120			$	(18	)

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Contingencies (Tables)

3 Months Ended

Mar. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

Schedule of Changes in Carrying Value of Recorded Environmental Remediation Reserves

The following table details the changes in the carrying value of recorded environmental remediation reserves:

Balance at December 31, 2023	$	268
Liabilities incurred		25
Cash payments		(49	)
Reversals of previously recorded liabilities		(12	)
Foreign currency translation and other		(12	)
Balance at December 31, 2024		220
Cash payments		(8	)
Foreign currency translation and other		1
Balance at March 31, 2025	$	213

Schedule of Estimate Timing of Cash Outflows on Environmental Reserves

The estimated timing of cash outflows from the environmental remediation reserve at March 31, 2025 was as follows:

2025 (excluding the three months ended March 31, 2025)	$	35
2026 – 2030		83
Thereafter		95
Total	$	213

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Other Financial Information (Tables)

3 Months Ended

Mar. 31, 2025

Other Financial Information [Abstract]

Schedule of Other (Income) Expenses, Net

Other (Income) Expenses, Net

	First quarter ended March 31,
	2025			2024
Equity loss	$	6		$	27
Foreign currency (gains) losses, net		(17	)		24
Net loss from asset sales		3			11
Net (gain) loss on mark-to-market derivative instruments		(7	)		5
Non-service costs – pension and other postretirement benefits		6			4
Other, net		(17	)		(12	)
	$	(26	)	$	59

Schedule of Other Noncurrent Assets

Other Noncurrent Assets

	March 31, 2025		December 31, 2024
Prepaid gas transmission contract	$	285	$	278
Gas supply prepayment		220		225
Value added tax credits		211		213
Deferred mining costs, net		196		184
Goodwill		143		142
Prepaid pension benefit		131		128
IRA Section 45X credit		85		71
Noncurrent restricted cash		68		53
Noncurrent prepaid tax asset		67		66
Intangibles, net		35		36
Other		101		101
	$	1,542	$	1,497

Schedule of Cash and Cash Equivalents and Restricted Cash

Cash and Cash Equivalents and Restricted Cash

	March 31, 2025		December 31, 2024
Cash and cash equivalents	$	1,202	$	1,138
Current restricted cash		20		43
Noncurrent restricted cash		68		53
	$	1,290	$	1,234

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Basis of Presentation - Additional Information (Detail)	Jul. 31, 2024
AWAC [Member] | Alcoa Corporation [Member]
Basis Of Presentation [Line Items]
Ownership interest percentage	60.00%

XML

Acquisitions and Divestitures - Additional Information (Detail) € in Millions, $ in Millions				3 Months Ended
	Sep. 15, 2024 USD ($) shares	Sep. 12, 2024 USD ($)	Aug. 01, 2024	Mar. 31, 2025 USD ($)	Mar. 31, 2025 EUR (€)	Mar. 31, 2024 USD ($)	Mar. 31, 2025 EUR (€)
Alcoa Corporation [Member]
Business Disposition [Line Items]
Carrying value of investment				$ 553
Alumina Limited [Member] | Aluminum Segment [Member]
Business Disposition [Line Items]
Ownership interest in joint venture			55.00%
Alumina Limited [Member] | AWAC [Member]
Business Disposition [Line Items]
Non-controlling interest, ownership percentage			40.00%
Saudi Arabia Joint Venture [Member]
Business Disposition [Line Items]
Sale of ownership interest under agreement exchange for issuance shares | shares	85,977,547
Sale of ownership interest under agreement exchange for issuance shares value		$ 950
Minimum holding period	3 years
Percentage of shares transferable	33.33%
Sale of ownership interest under agreement exchange for cash	$ 150
Ownership interest in joint venture	25.10%
Capital gain tax on implied shares value		$ 65
San Ciprian Joint Venture [Member] | Alcoa Corporation [Member]
Business Disposition [Line Items]
Contribution to joint venture				81	€ 75
Additional fund for operations				$ 108			€ 100
Percentage of shared fund				75.00%			75.00%
Ownership interest in joint venture				75.00%	75.00%
San Ciprian Joint Venture [Member] | IGNIS EQT [Member]
Business Disposition [Line Items]
Foreign currency translation adjustments reclassified to AOCI				$ 31
Net assets included in joint venture formation				103
Contribution to joint venture				27	€ 25
Contribution to form the joint venture				$ 108
Percentage of shared fund				25.00%			25.00%
Purchase percentage of interest				25.00%	25.00%
San Ciprian Joint Venture [Member] | IGNIS Equity Holdings SL [Member] | IGNIS EQT [Member]
Business Disposition [Line Items]
Non-controlling interest, ownership percentage				25.00%			25.00%
Warrick Rolling Mill [Member] | Disposal Group, Held-for-Sale, Not Discontinued Operations [Member]
Business Disposition [Line Items]
Estimated liabilities for future site separation commitment charge						$ 11
Payments against the reserve				$ 2		$ 7
Remaining reserve				$ 6

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Restructuring and Other Charges, Net - Additional Information (Detail) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Mar. 31, 2025 USD ($) Employees	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) Employees	Dec. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring And Other Charges	$ 5			$ 202
Cash payment for restructuring	49						$ 183
Restructuring and other charges, net	$ 5			202
Kwinana Refinery [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Other Charges				197
Severance costs				41
Number of employees | Employees	240
Asset impairments				5
Payments related to other costs	$ 41
Restructuring and other charges, net		$ 82	$ 8	197
Kwinana Refinery [Member] | Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees | Employees					50
Remaining cash outlays expected through 2025					$ 100
Alcoa Corporation [Member]
Restructuring Cost and Reserve [Line Items]
Noncurrent portion of the reserve	9	$ 8				$ 8	8
2024 Restructuring Plans Action [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net				202
2025 Restructuring Plans Action [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net	5
Certain Employee Obligations [Member] | San Ciprian Aluminum Smelter [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Other Charges	3
Severance and Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Cash payment for restructuring	1						38
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Cash payment for restructuring	48						$ 145
Water Management Costs [Member] | Kwinana Refinery [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Other Charges				123
Other Restructuring [Member] | Kwinana Refinery [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Other Charges				136		96
Asset Retirement Obligations [Member] | Kwinana Refinery [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Other Charges				15		$ (6)
Take Or-Pay Contracts [Member] | Kwinana Refinery [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Other Charges				$ 13
Contract Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net	$ 2

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Restructuring and Other Charges, Net - Schedule of Restructuring and Other Charges, Net by Reportable Segments, Pretax (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net	$ 5	$ 202
Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net	3	197
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net	2	5
Alumina [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net	0	197
Aluminum Segment [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net	$ 3	$ 0

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Restructuring and Other Charges, Net - Activity and Reserve Balances for Restructuring Charges (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	$ 181	$ 63
Restructuring and other charges, net	5	308
Cash payments	(49)	(183)
Reversals and other	3	(7)
Restructuring reserve ending balance	140	181
Severance and Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	13	6
Restructuring and other charges, net	0	44
Cash payments	(1)	(38)
Reversals and other	(1)	1
Restructuring reserve ending balance	11	13
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	168	57
Restructuring and other charges, net	5	264
Cash payments	(48)	(145)
Reversals and other	4	(8)
Restructuring reserve ending balance	$ 129	$ 168

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Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2025 Segment
Segment Reporting [Abstract]
Number of operating segments	2
Number of reportable segments	2
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	srt:ChiefExecutiveOfficerMember, srt:PresidentMember
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	The Company calculates Segment Adjusted EBITDA as Total sales (third-party and intersegment) minus the following items: Cost of goods sold; Selling, general administrative, and other expenses; and Research and development expenses. Alcoa Corporation’s Segment Adjusted EBITDA may not be comparable to similarly titled measures of other companies. The CODM regularly reviews Segment Adjusted EBITDA to assess performance and allocate resources (including employees, property, and financial or capital resources) in the planning and strategic review process.

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Segment Information - Schedule of Operating Results, Capital Expenditures and Assets of Alcoa's Reportable Segments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Adjusted operating costs	$ 2,297	$ 2,075
Other segment items	985	734
Segment Adjusted EBITDA	798	189
Depreciation, depletion, and amortization	143	155
Equity income (loss)	9	(9)
Capital expenditures	90	98
Equity investments	996		$ 966
Segment assets	12,564		12,267
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total sales	4,080	2,998
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales	716	399
Third-Party Sales [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Third-party sales	3,364	2,599
Alumina [Member]
Segment Reporting Information [Line Items]
Adjusted operating costs	723	796
Other segment items	788	421
Segment Adjusted EBITDA	664	139
Depreciation, depletion, and amortization	76	87
Equity income (loss)	15	(11)
Capital expenditures	53	57
Equity investments	443		420
Segment assets	6,295		6,138
Alumina [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total sales	2,175	1,356
Alumina [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales	712	395
Alumina [Member] | Third-Party Sales [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Third-party sales	1,463	961
Aluminum [Member]
Segment Reporting Information [Line Items]
Adjusted operating costs	1,574	1,279
Other segment items	197	313
Segment Adjusted EBITDA	134	50
Depreciation, depletion, and amortization	67	68
Equity income (loss)	(6)	2
Capital expenditures	37	41
Equity investments	553		546
Segment assets	6,269		$ 6,129
Aluminum [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total sales	1,905	1,642
Aluminum [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales	4	4
Aluminum [Member] | Third-Party Sales [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Third-party sales	$ 1,901	$ 1,638

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Segment Information - Schedule of Segment Adjusted EBITDA to Consolidated Net Income (Loss) Attributable to Alcoa Corporation (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total Segment Adjusted EBITDA	$ 798	$ 189
Transformation	(12)	(14)
Intersegment eliminations	103	(8)
Corporate expenses	(37)	(34)
Provision for depreciation, depletion, and amortization	(148)	(161)
Restructuring and other charges, net (D)	(5)	(202)
Interest expense	(53)	(27)
Other income (expenses), net (P)	26	(59)
Other	(4)	(9)
Consolidated income (loss) before income taxes	668	(325)
(Provision for) benefit from income taxes	(120)	18
Net loss attributable to noncontrolling interest	0	55
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	$ 548	$ (252)

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Segment Information - Schedule of Sales by Product Division (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation Of Revenue [Line Items]
Sales	$ 3,369	$ 2,599
Aluminum [Member]
Disaggregation Of Revenue [Line Items]
Sales	1,955	1,661
Alumina [Member]
Disaggregation Of Revenue [Line Items]
Sales	1,211	890
Bauxite [Member]
Disaggregation Of Revenue [Line Items]
Sales	242	61
Energy [Member]
Disaggregation Of Revenue [Line Items]
Sales	33	33
Other [Member]
Disaggregation Of Revenue [Line Items]
Sales	$ (72)	$ (46)

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Earnings Per Share - Schedule of Computation of Basic and Diluted EPS Attributable to Alcoa Corporation Common Shareholders (Detail) - shares shares in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Average shares outstanding - basic	259	179
Effect of dilutive securities:
Stock units	1
Average shares outstanding - diluted	260	179

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Earnings Per Share - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Undistributed earnings	$ 9
Stock Awards and Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares equivalents that would have been included in diluted average shares outstanding		2
Number of anti-dilutive securities		3

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Accumulated Other Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive (Loss) Income by Component (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Pension and other postretirement benefits (L)
Total Other comprehensive income	$ (5)	$ (10)
Foreign currency translation
Other comprehensive income (loss)	185	(176)
Joint venture formation (C)	(76)
Cash flow hedges (M)
Net change from periodic revaluations	(85)	117
Net amount reclassified to earnings	95	53
Total Accumulated other comprehensive loss	(4,935)		$ (5,110)
Alcoa Corporation [Member]
Pension and other postretirement benefits (L)
Balance at beginning of period	(11)	0
Unrecognized net actuarial gain/loss and prior service cost/benefit	(1)	4
Tax expense	(1)	(1)
Total Other comprehensive (loss) income before reclassifications, net of tax	(2)	3
Amortization of net actuarial gain/loss and prior service cost/benefit	7	6
Total amount reclassified from Accumulated other comprehensive loss, net of tax	7	6
Total Other comprehensive income	5	9
Balance at end of period	(6)	9
Foreign currency translation
Balance at beginning of period	(4,194)	(2,593)
Other comprehensive income (loss)	185	(122)
Joint venture formation (C)	(31)
Balance at end of period	(4,040)	(2,715)
Cash flow hedges (M)
Balance at beginning of period	(905)	(1,052)
Net change from periodic revaluations	(85)	117
Tax benefit (expense)	23	(31)
Total Other comprehensive (loss) income before reclassifications, net of tax	(62)	86
Net amount reclassified to earnings	95	53
Tax expense	(17)	(9)
Total amount reclassified from Accumulated other comprehensive loss, net of tax	78	44
Total Other comprehensive income	16	130
Balance at end of period	(889)	(922)
Total Accumulated other comprehensive loss	(4,935)	(3,628)
Alcoa Corporation [Member] | Aluminum Contracts [Member]
Cash flow hedges (M)
Net amount reclassified to earnings	93	57
Alcoa Corporation [Member] | Foreign Exchange Contract [Member]
Cash flow hedges (M)
Net amount reclassified to earnings	$ 2	(4)
Non-controlling Interest [Member]
Pension and other postretirement benefits (L)
Balance at beginning of period		(15)
Amortization of net actuarial gain/loss and prior service cost/benefit		1
Total amount reclassified from Accumulated other comprehensive loss, net of tax		1
Total Other comprehensive income		1
Balance at end of period		(14)
Foreign currency translation
Balance at beginning of period		(983)
Other comprehensive income (loss)		(54)
Balance at end of period		(1,037)
Cash flow hedges (M)
Total Accumulated other comprehensive loss		$ (1,051)

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Investments - Summary of Unaudited Financial Information for Alcoa Corporation's Equity Investments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Schedule of Equity Method Investments [Line Items]
Net income (loss)	$ 548	$ (307)
Ma'aden Joint Venture [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Sales	956	711
Cost of goods sold	775	599
Net income (loss)	13	(8)
Equity in net income (loss) of affiliated companies, before reconciling adjustments	3	(2)
Other	6	(8)
Alcoa Corporation [Member] | Ma'aden Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Alcoa Corporations equity in net income (loss) of affiliated companies	9	(10)
Mining [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Sales	168	115
Cost of goods sold	104	103
Net income (loss)	19	(5)
Equity in net income (loss) of affiliated companies, before reconciling adjustments	9	(2)
Other	0	0
Mining [Member] | Alcoa Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Alcoa Corporations equity in net income (loss) of affiliated companies	9	(2)
Energy [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Sales	58	63
Cost of goods sold	22	25
Net income (loss)	29	31
Equity in net income (loss) of affiliated companies, before reconciling adjustments	11	12
Other	0	(1)
Energy [Member] | Alcoa Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Alcoa Corporations equity in net income (loss) of affiliated companies	11	11
Other [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Sales	111	115
Cost of goods sold	100	105
Net income (loss)	(10)	(16)
Equity in net income (loss) of affiliated companies, before reconciling adjustments	(5)	(8)
Other	(7)	(5)
Other [Member] | Alcoa Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Alcoa Corporations equity in net income (loss) of affiliated companies	$ (12)	$ (13)

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Investments - Additional Information (Detail) - USD ($)	Sep. 15, 2024	Mar. 31, 2025	Mar. 31, 2024
ELYSIS TM Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Basis in investment, due to share of losses		$ 0	$ 0
Unrecognized losses		$ 60,000,000
Saudi Arabia Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of joint venture ownership interest sold	25.10%
Sale of ownership interest under agreement exchange for issuance shares	85,977,547
Sale of ownership interest under agreement exchange for cash	$ 150,000,000

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Receivables - Additional Information (Detail) - Receivables Purchase Agreement [Member] - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Nov. 14, 2024	Aug. 27, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unsold customer receivables as collateral sold receivables	$ 331		$ 247
Sale of gross customer receivables	199	$ 307
Reinvested collections from previously sold receivables	199	291
Cash proceeds from financial institution	0	$ 16
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables previously secured by credit facility				$ 150	$ 130
Accounts Payable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cash collections from previously sold receivables yet to be reinvested	$ 90		$ 50

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Inventories - Schedule of Inventory Components (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Inventory Disclosure [Abstract]
Finished goods	$ 414	$ 406
Work-in-process	276	251
Bauxite and alumina	657	551
Purchased raw materials	589	546
Operating supplies	246	244
Inventories, total	$ 2,182	$ 1,998

XML

Goodwill - Summary of Goodwill which is Included in Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Goodwill [Line Items]
Goodwill	$ 143	$ 142

XML

Goodwill - Summary of Goodwill which is Included in Other Noncurrent Assets (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Goodwill [Line Items]
Goodwill	$ 143	$ 142

XML

Debt - Additional Information (Detail) ¥ in Millions	1 Months Ended		3 Months Ended
	Apr. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 JPY (¥)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Short-term borrowings		$ 45,000,000	$ 45,000,000			$ 50,000,000
Borrowings of inventory related to agreement			44,000,000	$ 21,000,000
Repurchase of inventory related to agreement			49,000,000	$ 25,000,000
Alcoa Nederland Holding BV [Member] | 5.500% Notes, due 2027 [Member]
Debt Instrument [Line Items]
Principal amount of debt		$ 750,000,000	$ 750,000,000
Senior notes, interest percentage		5.50%	5.50%
Debt instrument maturity date		2027	2027
Alcoa Nederland Holding BV [Member] | 6.125% Notes, due 2028 [Member]
Debt Instrument [Line Items]
Principal amount of debt		$ 500,000,000	$ 500,000,000
Senior notes, interest percentage		6.125%	6.125%
Debt instrument maturity date		2028	2028
Alcoa Nederland Holding BV [Member] | 7.125% Notes, due 2031 [Member]
Debt Instrument [Line Items]
Senior notes, interest percentage				7.125%	7.125%
Alumina Pty Ltd [Member] | 6.125% Notes, due 2030 [Member]
Debt Instrument [Line Items]
Principal amount of debt		$ 500,000,000	$ 500,000,000
Proceeds from issuance of public debt offering		$ 985,000,000
Senior notes, interest percentage		6.125%	6.125%
Debt instrument maturity date		2030	2030
Debt instrument, frequency of periodic payment			semi-annually
Debt instrument, date of first required payment		Sep. 15, 2025
Alumina Pty Ltd [Member] | 6.125% Notes, due 2030 [Member] | After March 15, 2027 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period			10 days
Alumina Pty Ltd [Member] | 6.125% Notes, due 2030 [Member] | After March 15, 2027 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period			60 days
Debt instrument redemption price percentage			103.063%
Alumina Pty Ltd [Member] | 6.125% Notes, due 2030 [Member] | Change in Control [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price percentage			101.00%
Alumina Pty Ltd [Member] | 6.375% Notes, due 2032 [Member]
Debt Instrument [Line Items]
Principal amount of debt		$ 500,000,000	$ 500,000,000
Proceeds from issuance of public debt offering		$ 985,000,000
Senior notes, interest percentage		6.375%	6.375%
Debt instrument maturity date		2032	2032
Debt instrument, frequency of periodic payment			semi-annually
Debt instrument, date of first required payment		Sep. 15, 2025
Alumina Pty Ltd [Member] | 6.375% Notes, due 2032 [Member] | After March 15, 2027 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period			10 days
Alumina Pty Ltd [Member] | 6.375% Notes, due 2032 [Member] | After March 15, 2027 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period			60 days
Debt instrument redemption price percentage			103.188%
Alumina Pty Ltd [Member] | 6.375% Notes, due 2032 [Member] | Change in Control [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price percentage			101.00%
Subsequent Event [Member]
Debt Instrument [Line Items]
Extended maturity date of credit facility	2025-11
Subsequent Event [Member] | Other Long Term Debt [Member]
Debt Instrument [Line Items]
Amounts borrowed under the credit facility	$ 74,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal amount of debt		$ 0	$ 0			0
Amounts borrowed under the credit facility			0	$ 0
Unsecured revolving credit facility		1,250,000,000	1,250,000,000
$250 Japanese Yen Revolving Credit Facility [Member] | Alcoa Nederland Holding BV [Member]
Debt Instrument [Line Items]
Principal amount of debt		0	0			$ 0
Amounts borrowed under the credit facility			0	201,000,000	¥ 29,686
Amounts repaid under the credit facility				$ 196,000,000	¥ 29,686
Unsecured revolving credit facility		250,000,000	250,000,000
Extended maturity date of credit facility	2026-04
$250 Japanese Yen Revolving Credit Facility [Member] | Subsequent Event [Member] | Alcoa Nederland Holding BV [Member]
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 200,000,000
Tender Offers [Member] | Alcoa Nederland Holding BV [Member] | 5.500% Notes, due 2027 [Member]
Debt Instrument [Line Items]
Principal amount of debt		750,000,000	750,000,000
Settlement of debt		609,000,000
Debt settlement expenses			12,000,000
Tender Offers [Member] | Alcoa Nederland Holding BV [Member] | 6.125% Notes, due 2028 [Member]
Debt Instrument [Line Items]
Principal amount of debt		500,000,000	500,000,000
Settlement of debt		$ 281,000,000
Debt settlement expenses			$ 12,000,000

XML

Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 2	$ 2
Interest cost	[1]	25	27
Expected return on plan assets	[1]	(31)	(35)
Recognized net actuarial loss	[1]	9	8
Curtailments	[2]		1
Net periodic benefit cost		5	3
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost			1
Interest cost	[1]	5	6
Recognized net actuarial loss	[1]	1	1
Amortization of prior service benefit	[1]	(3)	(3)
Net periodic benefit cost		$ 3	$ 5

[1] These amounts were reported in Other (income) expenses, net on the accompanying Statement of Consolidated Operations (see Note P).

[2] This amount was reported in Restructuring and other charges, net on the accompanying Statement of Consolidated Operations and Cash Flows.

XML

Pension and Other Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) to other noncurrent assets	$ 47	$ (9)
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum required cash contribution to pension plans	19
Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum required cash contribution to pension plans	$ 12	$ 6

XML

Derivatives and Other Financial Instruments - Additional Information (Detail) kt in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) Member kt	Mar. 31, 2024 USD ($)	Dec. 31, 2024 kt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Minimum members required for strategic risk management committee | Member	3
Realized gain (loss) reclassified from Accumulated other comprehensive loss to earnings	$ (95)	$ (53)
Level 1 Derivative Instruments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Realized gain (loss) reclassified from Accumulated other comprehensive loss to earnings	$ (2)	4
Commodity Contract | Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, expiration month and year	2025-12
Commodity Contract | Level 1 [Member] | Spain [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, expiration month and year	2027-12
Foreign Exchange Forward | Spain [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, expiration month and year	2027-12
Foreign Exchange Forward | Norway [Member] | Euro Power Purchases [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, expiration month and year	2028-03
Foreign Exchange Forward | Norway [Member] | Krone Capital Expenditures [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, expiration month and year	2025-06
Foreign Exchange Forward | Brazil [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, expiration month and year	2026-10
Foreign Exchange Forward | Canada [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, expiration month and year	2025-03
Foreign Exchange Forward | Australia [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, expiration month and year	2026-12
Natural Gas [Member] | Spain [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, expiration month and year	2027-12
Derivatives Designated as Hedging Instruments [Member] | Power Contract [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Aluminum forecast sales | kt	1,175		1,230
Derivatives Designated as Hedging Instruments [Member] | Power Contract [Member] | Cash Flow Hedging [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amount of (loss) gain expected to be recognized into earnings over the next 12 months	$ 249
Derivatives Designated as Hedging Instruments [Member] | Sales [Member] | Level 1 Derivative Instruments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Realized gain (loss) reclassified from Accumulated other comprehensive loss to earnings	$ (2)	$ 4

XML

Derivatives and Other Financial Instruments - Schedule of Detail for Level 1 and 3 Derivatives (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Assets Current	$ 38		$ 25
Derivative Liabilities Current	258		263
Derivative Assets Noncurrent	11		0
Derivative Liabilities Noncurrent	850		836
Unrealized gain (loss) recognized in Other comprehensive income (loss)	(85)	$ 117
Realized gain (loss) reclassified from Accumulated other comprehensive loss to earnings	(95)	(53)
Level 1 Derivative Instruments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Assets	19		1
Derivative Liabilities	12		20
Unrealized gain (loss) recognized in Other comprehensive income (loss)	24	(3)
Realized gain (loss) reclassified from Accumulated other comprehensive loss to earnings	(2)	4
Level 3 Derivative Instruments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Assets	30		24
Derivative Liabilities	1,096		1,079
Unrealized gain (loss) recognized in Other comprehensive income (loss)	(109)	120
Realized gain (loss) reclassified from Accumulated other comprehensive loss to earnings	(93)	$ (57)
Level 1 and 3 Derivative Instruments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Assets	49		25
Derivative Liabilities	1,108		1,099
Derivative Assets Current	38		25
Derivative Liabilities Current	258		263
Derivative Assets Noncurrent	11		0
Derivative Liabilities Noncurrent	$ 850		$ 836

XML

Derivatives and Other Financial Instruments - Schedule of Outstanding Quantities of Derivative Instruments (Detail) - Level 1 [Member] kt in Thousands, € in Millions, kr in Millions, R$ in Millions, $ in Millions, $ in Millions	Mar. 31, 2025 EUR (€) MWh kt	Mar. 31, 2025 NOK (kr) MWh kt	Mar. 31, 2025 BRL (R$) MWh kt	Mar. 31, 2025 AUD ($) MWh kt	Mar. 31, 2025 CAD ($) MWh kt	Mar. 31, 2024 EUR (€) MWh kt	Mar. 31, 2024 NOK (kr) MWh kt	Mar. 31, 2024 BRL (R$) MWh kt	Mar. 31, 2024 AUD ($) MWh kt	Mar. 31, 2024 CAD ($) MWh kt
Foreign Exchange Buy Forwards [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Liabilities	€ 163	kr 20	R$ 160	$ 41	$ 0	€ 79	kr 102	R$ 450	$ 0	$ 26
Foreign Exchange Buy Forwards Undesignated [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Liabilities | €	852					0
Foreign Exchange Sell Forwards [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Liabilities | €	€ 11					€ 17
Commodity Sell Forwards [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Outstanding quantities of derivative instruments | kt	458	458	458	458	458	44	44	44	44	44
Commodity Buy Forwards [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Outstanding quantities of derivative instruments | kt	173	173	173	173	173	101	101	101	101	101
Outstanding energy derivative instruments | MWh	2	2	2	2	2	0	0	0	0	0

XML

Derivatives and Other Financial Instruments - Schedule of Quantitative Information for Level 3 Derivative Contracts (Detail) - Energy Contracts [Member] - Level 3 [Member] MWh in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) MWh $ / MW $ / lb
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Assets, Fair value	$ 30,000,000
Derivative Liabilities, Fair value	1,096,000,000
Financial Contracts [Member] | Interrelationship of Forward Energy Price, LME Forward Price and Consumer Price Index [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Assets, Fair value	$ 30,000,000
Financial Contracts [Member] | Interrelationship of Forward Energy Price, LME Forward Price and Consumer Price Index [Member] | Minimum [Member] | 2025 [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative forward energy price | $ / MW	31.92
LME forward price	$ 2,516
Financial Contracts [Member] | Interrelationship of Forward Energy Price, LME Forward Price and Consumer Price Index [Member] | Maximum [Member] | 2025 [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative forward energy price | $ / MW	60.48
LME forward price	$ 2,547
Power Contract [Member] | MWh of Energy Needed to Produce Forecasted Mt of Aluminum at Rate of 2 Million MWh Per Year [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative forward energy volume | MWh	2
Power Contract [Member] | MWh of Energy Needed to Produce Forecasted Mt of Aluminum at Rate of 2 Million MWh Per Year [Member] | Minimum [Member] | 2025 [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
LME forward price	$ 2,516
Midwest aluminum premium | $ / lb	0.52
Power Contract [Member] | MWh of Energy Needed to Produce Forecasted Mt of Aluminum at Rate of 2 Million MWh Per Year [Member] | Maximum [Member] | 2025 [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
LME forward price	$ 2,530
Midwest aluminum premium | $ / lb	0.52
Power Contract [Member] | MWh of Energy Needed to Produce Forecasted Mt of Aluminum at Rate of 4 Million MWh Per Year [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Liabilities, Fair value	$ 135,000,000
Derivative forward energy volume | MWh	4
Power Contract [Member] | MWh of Energy Needed to Produce Forecasted Mt of Aluminum at Rate of 4 Million MWh Per Year [Member] | 2025 [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
LME forward price	$ 2,516
Power Contract [Member] | MWh of Energy Needed to Produce Forecasted Mt of Aluminum at Rate of 4 Million MWh Per Year [Member] | 2027 [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
LME forward price	2,624
Power Contract [Member] | MWh of Energy Needed to Produce Forecasted Mt of Aluminum at Rate of 18 Million MWh Per Year [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Liabilities, Fair value	$ 958,000,000
Derivative forward energy volume | MWh	18
Power Contract [Member] | MWh of Energy Needed to Produce Forecasted Mt of Aluminum at Rate of 18 Million MWh Per Year [Member] | 2025 [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
LME forward price	$ 2,516
Midwest aluminum premium | $ / lb	0.52
Power Contract [Member] | MWh of Energy Needed to Produce Forecasted Mt of Aluminum at Rate of 18 Million MWh Per Year [Member] | 2029 [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
LME forward price	$ 2,701
Midwest aluminum premium | $ / lb	0.52
Power Contract [Member] | MWh of Energy Needed to Produce Forecasted Mt of Aluminum at Rate of 18 Million MWh Per Year [Member] | 2036 [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
LME forward price	$ 2,888
Midwest aluminum premium | $ / lb	0.52
Power Contract [Member] | Estimated Spread Between The Respective 30-Year Debt Yield Of Alcoa Corporation And The Counterparty [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Liabilities, Fair value	$ 3,000,000
Percentage of debt yield credit spread	1.35%
Power Contract [Member] | Estimated Spread Between The Respective 30-Year Debt Yield Of Alcoa Corporation And The Counterparty [Member] | Counterparty [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Percentage of debt yield credit spread	5.35%
Power Contract [Member] | Estimated Spread Between The Respective 30-Year Debt Yield Of Alcoa Corporation And The Counterparty [Member] | Alcoa Corporation [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Percentage of debt yield credit spread	6.70%

XML

Derivatives and Other Financial Instruments - Schedule of Fair Values of Level 3 Derivative Instruments Recorded as Assets and Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivative Instruments Gain Loss [Line Items]
Total asset derivatives	$ 38	$ 25
Total liability derivatives	258	263
Total liability derivatives	850	836
Level 3 [Member] | Energy Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Total asset derivatives	30	24
Total liability derivatives	1,096	1,079
Level 3 [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Energy Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Total asset derivatives	30	24
Total liability derivatives	3	2
Level 3 [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Embedded Credit Derivative [Member] | Energy Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Total liability derivatives	1	1
Total liability derivatives	2	1
Level 3 [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Financial Contracts [Member] | Energy Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Total asset derivatives	30	24
Level 3 [Member] | Derivatives Designated as Hedging Instruments [Member] | Energy Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Total liability derivatives	1,093	1,077
Level 3 [Member] | Derivatives Designated as Hedging Instruments [Member] | Power Contract [Member] | Energy Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Total liability derivatives	249	251
Total liability derivatives	$ 844	$ 826

XML

Derivatives and Other Financial Instruments - Schedule of Reconciliation of Activity for Derivative Contracts (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Financial Contracts [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Assets, Beginning balance	$ 24
Settlements and other	(2)
Fair value measurement, Assets, Ending balance	30
Financial Contracts [Member] | Other Income, Net [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Assets	8
Financial Contracts [Member] | Other Income, Net [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Assets	8
Power Contract [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Liabilities, Beginning balance	1,077
Fair value measurement, Liabilities	$ 0
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Revenue from Contract with Customer, Excluding Assessed Tax
Other comprehensive loss (unrealized)	$ 109
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax
Fair value measurement, Liabilities, Ending balance	$ 1,093
Power Contract [Member] | Sales [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Liabilities	(93)
Power Contract [Member] | Other Income, Net [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Liabilities	0
Embedded Credit Derivative [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Liabilities, Beginning balance	2
Fair value measurement, Liabilities	$ 1
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Revenue from Contract with Customer, Excluding Assessed Tax
Other comprehensive loss (unrealized)	$ 0
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax
Fair value measurement, Liabilities, Ending balance	$ 3
Embedded Credit Derivative [Member] | Sales [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Liabilities	0
Embedded Credit Derivative [Member] | Other Income, Net [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Liabilities	$ 1

XML

Derivatives and Other Financial Instruments - Schedule of Carrying Values and Fair Values of Other Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Short-term borrowings	$ 45	$ 50
Carrying Value [Member]
Derivative [Line Items]
Cash and cash equivalents	1,202	1,138
Restricted cash	88	96
Short-term borrowings	45	50
Long-term debt due within one year	75	75
Long-term debt, less amount due within one year	2,573	2,470
Fair Value [Member]
Derivative [Line Items]
Cash and cash equivalents	1,202	1,138
Restricted cash	88	96
Short-term borrowings	45	50
Long-term debt due within one year	75	75
Long-term debt, less amount due within one year	$ 2,594	$ 2,499

XML

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Income Taxes [Line Items]
Effective federal statutory tax rate	21.00%
Effective foreign statutory tax rate	21.00%
Foreign [Member] | ANHBV [Member]
Income Taxes [Line Items]
Deferred tax assets, valuation allowance	$ 248
Foreign [Member] | AWAB [Member]
Income Taxes [Line Items]
Deferred tax assets, valuation allowance	109
Cost of Goods Sold [Member]
Income Taxes [Line Items]
Income tax benefits recorded in Cost of goods sold	14	$ 9
Other Receivables [Member]
Income Taxes [Line Items]
Income tax benefits due to inflation reduction act tax credits	36		$ 36
Other Noncurrent Assets [Member]
Income Taxes [Line Items]
Income tax benefits due to inflation reduction act tax credits	$ 85		$ 71

XML

Income Taxes - Schedule of Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 668	$ (325)
Estimated annualized effective tax rate	19.30%	(8.90%)
Income tax expense	$ 129	$ 29
Favorable tax impact related to losses in jurisdictions with no tax benefit	(11)	(47)
Discrete tax expense	2	0
Provision for (benefit from) income taxes	$ 120	$ (18)

XML

Contingencies - Changes in Carrying Value of Recorded Environmental Remediation Reserves (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Beginning balance	$ 220	$ 268	$ 268
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Environmental remediation (O)		Environmental remediation (O)
Liabilities incurred			$ 25
Cash payments	$ (8)	$ (6)	(49)
Reversals of previously recorded liabilities			(12)
Foreign currency translation and other	1		(12)
Ending balance	$ 213		$ 220

XML

Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025 USD ($) Project	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Loss Contingencies [Line Items]
Liabilities incurred			$ 25
Payments against the reserve	$ 8	$ 6	49
Reversals of previously recorded liabilities			12
Environmental remediation reserve balance, current	$ 44		$ 38
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current		Other Liabilities, Current
Active or future remediation for significant sites	$ 151		$ 154
Accrued environmental reserves	$ 213		220	$ 268
Massena, New York [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Environmental remediation work completion period	8 years
Addy, Washington [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Environmental remediation work completion period	3 years
Addy, Washington [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Environmental remediation work completion period	5 years
Ferndale, Washington [Member]
Loss Contingencies [Line Items]
Post-closure maintenance and monitoring period	5 years
Other Sites [Member]
Loss Contingencies [Line Items]
Number of remediation projects | Project	31
Accrued environmental reserves	$ 62		$ 66

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Contingencies - Additional Information - 1 (Detail) R$ in Millions, $ in Millions, $ in Millions			1 Months Ended															3 Months Ended			12 Months Ended		14 Months Ended
	Sep. 17, 2020 USD ($)	Sep. 17, 2020 AUD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 BRL (R$)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 BRL (R$)	Aug. 31, 2022 USD ($)	Aug. 31, 2022 BRL (R$)	Jul. 31, 2022 USD ($)	Jul. 31, 2022 BRL (R$)	Mar. 31, 2022 USD ($)	Mar. 31, 2022 BRL (R$)	Feb. 28, 2022 USD ($)	Feb. 28, 2022 BRL (R$)	Mar. 31, 2013 USD ($)	May 31, 2012 USD ($)	May 31, 2012 BRL (R$)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 BRL (R$)	Sep. 30, 2020 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 BRL (R$)	Jun. 30, 2026 USD ($)	Jun. 30, 2026 AUD ($)	Mar. 31, 2025 AUD ($)	Dec. 31, 2024 AUD ($)	Jul. 31, 2024	Jul. 31, 2022 BRL (R$)	Feb. 28, 2022 BRL (R$)	Sep. 30, 2020 AUD ($)	Jul. 07, 2020 USD ($)	Jul. 07, 2020 AUD ($)	Mar. 31, 2013 BRL (R$)	Dec. 31, 2012 BRL (R$)
Loss Contingencies [Line Items]
Other noncurrent liabilities and deferred credits			$ 656															$ 644
Australian Taxation Office [Member] | Foreign Jurisdiction [Member] | AofA [Member]
Loss Contingencies [Line Items]
Additional income tax payable, exclusive of interest and penalties																															$ 135	$ 214
Notices include claims for compounded interest on the tax amount																															$ 445	$ 707
Proposed administrative penalties	$ 81	$ 128
Payment of dispute resolution practices income tax percentage																				50.00%
Assessed income tax amount exclusive of interest and penalties																				$ 74										$ 107
Other noncurrent liabilities and deferred credits			206															216							$ 343	$ 332
Tax assessment deposit																		67							$ 107
Australian Taxation Office [Member] | Foreign Jurisdiction [Member] | AofA [Member] | Forecast [Member]
Loss Contingencies [Line Items]
Net cash tax impact																							$ 149	$ 236
Alcoa World Alumina Brasil [Member] | Brazilian Federal Revenue Office [Member]
Loss Contingencies [Line Items]
Disallowed tax credits									$ 13				$ 4		$ 110													R$ 66	R$ 19				R$ 220
Percentage of penalty of the gross disallowed amount															50.00%
Value added tax receivable			$ 1	R$ 6	$ 1	R$ 5	$ 6	R$ 31	$ 10	R$ 53	$ 9	R$ 44	$ 14	R$ 65		$ 41	R$ 82
Federal value added tax credits																					$ 136													R$ 273
Value added tax refund received																					$ 68	R$ 136
Alcoa Corporation [Member] | AWAC [Member]
Loss Contingencies [Line Items]
Ownership interest percentage																											60.00%
Minimum [Member] | Alcoa World Alumina Brasil [Member] | Brazilian Federal Revenue Office [Member]
Loss Contingencies [Line Items]
Charge recorded in provision for income taxes to establish liability for estimated loss																		0
Maximum [Member] | Alcoa World Alumina Brasil [Member] | Brazilian Federal Revenue Office [Member]
Loss Contingencies [Line Items]
Charge recorded in provision for income taxes to establish liability for estimated loss																		$ 52	R$ 300

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Contingencies - Estimate Timing of Cash Outflows on Environmental Reserves (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
2025 (excluding the three months ended March 31, 2025)	$ 35
2026 - 2030	83
Thereafter	95
Total	$ 213	$ 220	$ 268

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Other Financial Information - Schedule of Other (Income) Expenses, Net (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Other Income and Expenses [Abstract]
Equity loss	$ 6	$ 27
Foreign currency (gains) losses, net	(17)	24
Net loss from asset sales	3	11
Net (gain) loss on mark-to-market derivative instruments	(7)	5
Non-service costs - pension and other postretirement benefits	6	4
Other, net	(17)	(12)
Other expenses, net	$ (26)	$ 59

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Other Financial Information - Schedule of Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Other Financial Information [Abstract]
Prepaid gas transmission contract	$ 285	$ 278
Gas supply prepayment	220	225
Value added tax credits	211	213
Deferred mining costs, net	196	184
Goodwill	143	142
Prepaid pension benefit	131	128
IRA Section 45X credit	85	71
Noncurrent restricted cash	68	53
Noncurrent prepaid tax asset	67	66
Intangibles, net	35	36
Other	101	101
Other assets, noncurrent, total	$ 1,542	$ 1,497

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Other Financial Information - Additional Information (Detail) - San Ciprián Smelter [Member] $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Other Non Operating Income Expense [Line Items]
Amount released from restricted cash	$ 11
Capital improvements at the site	$ 75

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Other Financial Information - Schedule of Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Other Financial Information [Abstract]
Cash and cash equivalents	$ 1,202	$ 1,138
Current restricted cash	20	43
Noncurrent restricted cash	68	53
Cash and cash equivalents and restricted cash, total	$ 1,290	$ 1,234	$ 1,455	$ 1,047

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Supplier Finance Programs - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Supplier invoices outstanding	$ 97	$ 94
Minimum [Member]
Payment terms	50 days
Maximum [Member]
Payment terms	110 days