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.