Restructuring and Other Charges, Net (Tables)

9 Months Ended

Sep. 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:

	Third quarter ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
Bauxite	$	—	$	1	$	—	$	1
Alumina		—		3		—		5
Aluminum		23		1		41		40
Segment total		23		5		41		46
Corporate		10		—		32		(2	)
Total Restructuring and other charges, net	$	33	$	5	$	73	$	44

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		—			12			12
Cash payments		(4	)		(23	)		(27	)
Reversals and other		—			(6	)		(6	)
Balance at September 30, 2021	$	2		$	40		$	42