Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Goodwill which is Included in Other Noncurrent Assets

Goodwill, which is included in Other noncurrent assets on the accompanying Consolidated Balance Sheet, was as follows:

December 31,	2020		2019
Bauxite	$	2	$	2
Alumina		2		3
Aluminum		—		—
Corporate(1)		141		145
	$	145	$	150

⁽¹⁾ The carrying value of Corporate’s goodwill is net of accumulated impairment losses of $742 as of both December 31, 2020 and 2019. As of December 31, 2020, the $141 of goodwill reflected in Corporate is allocated to two of Alcoa Corporation’s three reportable segments ($47 to Bauxite and $94 to Alumina) for purposes of impairment testing (see Note B). This goodwill is reflected in Corporate for segment reporting purposes because it is not included in management’s assessment of performance by the two reportable segments.

Other Intangible Assets

Other intangible assets, which are included in Other noncurrent assets on the accompanying Consolidated Balance Sheet, were as follows:

	2020							2019
December 31,	Gross carrying amount		Accumulated amortization			Net carrying amount		Gross carrying amount		Accumulated amortization			Net carrying amount
Computer software	$	236	$	(218	)	$	18	$	240	$	(216	)	$	24
Patents and licenses		25		(8	)		17		25		(8	)		17
Other intangibles		20		(10	)		10		22		(11	)		11
Total other intangible assets	$	281	$	(236	)	$	45	$	287	$	(235	)	$	52