Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2019

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 $111 and $122 was classified as a current liability as of December 31, 2019 and 2018, respectively:

December 31,	2019		2018
Mine reclamation	$	205	$	198
Closure of bauxite residue areas		282		231
Spent pot lining disposal		106		113
Demolition		85		76
Landfill closure		39		33
Balance at end of year	$	717	$	651

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,	2019			2018
Balance at beginning of year	$	651		$	725
Accretion expense		22			17
Liabilities incurred		148			63
Payments		(90	)		(80	)
Reversals of previously recorded liabilities		(12	)		(37	)
Foreign currency translation and other		(2	)		(37	)
Balance at end of year	$	717		$	651