Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Carrying Value of Recorded AROs by Major Category

The following table details the carrying value of recorded AROs by major category, of which $116 and $128 was classified as a current liability as of December 31, 2021 and 2020, respectively:

December 31,	2021		2020
Closure of bauxite residue areas	$	274	$	278
Mine reclamation		255		264
Spent pot lining disposal		107		108
Demolition		72		72
Landfill closure		30		31
Balance at end of year	$	738	$	753

Schedule of Changes in Carrying Value of Recorded AROs

The following table details the changes in the total carrying value of recorded AROs:

December 31,	2021			2020
Balance at beginning of year	$	753		$	717
Accretion expense		20			21
Liabilities incurred		101			107
Payments		(101	)		(93	)
Reversals of previously recorded liabilities		(6	)		(17	)
Foreign currency translation and other		(29	)		18
Balance at end of year	$	738		$	753