Statement of Consolidated Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash from Operations
Net income (loss)	$ (773)	$ 38	$ 570
Adjustments to reconcile net (loss) income to cash from operations:
Depreciation, depletion, and amortization	632	617	664
Deferred income taxes (Q)	(22)	219	147
Equity loss (income), net of dividends (H)	201	4	(138)
Restructuring and other charges, net (D)	184	696	1,128
Net loss (gain) from investing activities—asset sales (U)	18	10	(354)
Net periodic pension benefit cost (O)	6	54	47
Stock-based compensation (N)	35	40	39
Premium paid on early redemption of debt			43
Loss (gain) on mark-to-market derivative financial contracts	26	(44)	(24)
Other	78	53	49
Changes in assets and liabilities, excluding effects of divestitures and foreign currency translation adjustments:
Decrease (increase) in receivables	104	(59)	(414)
Decrease (increase) in inventories (J)	243	(547)	(639)
Decrease (increase) in prepaid expenses and other current assets	39	44	(41)
(Decrease) increase in accounts payable, trade	(74)	189	354
Decrease in accrued expenses	(133)	(173)	(38)
(Decrease) increase in taxes, including income taxes	(146)	(152)	301
Pension contributions (O)	(24)	(17)	(579)
Increase (decrease) to other noncurrent assets	(210)	(87)	(160)
Decrease in noncurrent liabilities	(93)	(63)	(35)
Cash provided from operations	91	822	920
Financing Activities
Additions to debt (M)	127	4	495
Payments on debt (M)	(72)	(1)	(1,294)
Proceeds from the exercise of employee stock options (N)	1	22	25
Repurchase of common stock (N)		(500)	(150)
Dividends paid on Alcoa common stock (N)	(72)	(72)	(19)
Payments related to tax withholding on stock-based compensation awards	(34)	(19)	(1)
Financial contributions for the divestiture of businesses (C)	(52)	(33)	(17)
Contributions from noncontrolling interest (A)	188	214	21
Distributions to noncontrolling interest	(30)	(379)	(215)
Other	1	(4)	(3)
Cash provided from (used for) financing activities	57	(768)	(1,158)
Investing Activities
Capital expenditures	(531)	(480)	(390)
Proceeds from the sale of assets and businesses (C)	4	5	966
Additions to investments (H)	(70)	(32)	(11)
Sale of investments (H)		10
Other	12	2
Cash (used for) provided from investing activities	(585)	(495)	565
Effect of exchange rate changes on cash and cash equivalents and restricted cash	10	(9)	(13)
Net change in cash and cash equivalents and restricted cash	(427)	(450)	314
Cash and cash equivalents and restricted cash at beginning of year	1,474	1,924	1,610
Cash and cash equivalents and restricted cash at end of year	$ 1,047	$ 1,474	$ 1,924