Statement of Consolidated Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash from Operations
Net income (loss)	$ 570	$ (14)	$ (853)
Adjustments to reconcile net income (loss) to cash from operations:
Depreciation, depletion, and amortization	664	653	713
Deferred income taxes (Q)	147	(26)	15
Equity earnings, net of dividends (H)	(138)	20	21
Restructuring and other charges, net (D)	1,128	104	1,031
Net gain from investing activities—asset sales (U)	(354)	(173)	(3)
Net periodic pension benefit cost (O)	47	138	119
Stock-based compensation (N)	39	25	30
Provision for bad debt expense	1	2	21
Premium paid on early redemption of debt	43
Other	24	32	30
Changes in assets and liabilities, excluding effects of divestitures and foreign currency translation adjustments:
(Increase) decrease in receivables	(414)	16	283
(Increase) decrease in inventories (J)	(639)	122	137
(Increase) decrease in prepaid expenses and other current assets	(41)	17	27
Increase (decrease) in accounts payable, trade	354	25	(153)
(Decrease) in accrued expenses	(38)	(153)	(175)
Increase (decrease) in taxes, including income taxes	301	119	(330)
Pension contributions (O)	(579)	(343)	(173)
(Increase) in noncurrent assets	(160)	(82)	(24)
(Decrease) in noncurrent liabilities	(35)	(88)	(30)
Cash provided from operations	920	394	686
Financing Activities
Additions to debt (original maturities greater than three months) (M)	495	739
Payments on debt (original maturities greater than three months) (M)	(1,294)	(1)	(7)
Proceeds from the exercise of employee stock options (N)	25	1	2
Repurchase of common stock (N)	(150)
Dividends paid on Alcoa common stock (N)	(19)
Financial contributions for the divestiture of businesses (C)	(17)	(38)	(12)
Contributions from noncontrolling interest (A)	21	24	51
Distributions to noncontrolling interest	(215)	(207)	(472)
Other	(4)	(4)	(6)
Cash (used for) provided from financing activities	(1,158)	514	(444)
Investing Activities
Capital expenditures	(390)	(353)	(379)
Proceeds from the sale of assets and businesses (C)	966	198	23
Additions to investments (H)	(11)	(12)	(112)
Cash provided from (used for) investing activities	565	(167)	(468)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(13)	(14)	(7)
Net change in cash and cash equivalents and restricted cash	314	727	(233)
Cash and cash equivalents and restricted cash at beginning of year	1,610	883	1,116
Cash and cash equivalents and restricted cash at end of year	$ 1,924	$ 1,610	$ 883