Consolidated Balance Sheet (unaudited) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents (M)	$ 1,485		$ 1,138
Receivables from customers (I)	1,045		1,096
Other receivables	149		143
Inventories (J)	2,191		1,998
Fair value of derivative instruments (M)	44		25
Prepaid expenses and other current assets	370		514
Total current assets	5,284		4,914
Properties, plants, and equipment	20,800		19,550
Less: accumulated depreciation, depletion, and amortization	14,171		13,161
Properties, plants, and equipment, net	6,629		6,389
Investments (H)	480		980
Noncurrent marketable securities (C & M)	1,467		0
Deferred income taxes	524		284
Fair value of derivative instruments (M)	47		0
Other noncurrent assets (Q)	1,538		1,497
Total assets	15,969		14,064
Current liabilities:
Accounts payable, trade	1,618		1,805
Accrued compensation and retirement costs	370		362
Taxes, including income taxes	339		102
Fair value of derivative instruments (M)	329		263
Other current liabilities	730		788
Long-term debt due within one year (K & M)	0		75
Total current liabilities	3,386		3,395
Long-term debt, less amount due within one year (K & M)	2,578		2,470
Accrued pension benefits (L)	227		256
Accrued other postretirement benefits (L)	391		412
Asset retirement obligations (O)	1,207		691
Environmental remediation (P)	205		182
Fair value of derivative instruments (M)	929		836
Noncurrent income taxes	109		9
Other noncurrent liabilities and deferred credits	506		656
Total liabilities	9,538		8,907
CONTINGENCIES AND COMMITMENTS (P)
MEZZANINE EQUITY
Noncontrolling interest (C)	86		0
Alcoa Corporation shareholders’ equity:
Preferred stock	0		0
Common stock	3		3
Additional capital	11,570		11,587
Accumulated deficit	(458)		(1,323)
Accumulated other comprehensive loss (G)	(4,770)		(5,110)
Total equity	6,345	$ 6,135	5,157
Total liabilities, mezzanine equity, and equity	$ 15,969		$ 14,064