Restructuring and Other Charges, Net (Tables)

6 Months Ended

Jun. 30, 2021

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:

	Second quarter ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Bauxite	$	—	$	—	$	—	$	—
Alumina		—		—		—		2
Aluminum		3		37		18		39
Segment total		3		37		18		41
Corporate		30		—		22		(2	)
Total Restructuring and other charges, net	$	33	$	37	$	40	$	39

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, 2019	$	35		$	102		$	137
Restructuring and other charges, net		16			36			52
Cash payments		(41	)		(79	)		(120	)
Reversals and other		(4	)		(2	)		(6	)
Balance at December 31, 2020		6			57			63
Restructuring and other charges, net		—			10			10
Cash payments		(3	)		(21	)		(24	)
Reversals and other		—			—			—
Balance at June 30, 2021	$	3		$	46		$	49