Properties, Plants, and Equipment, Net

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Properties, Plants, and Equipment, Net

J. Properties, Plants, and Equipment, Net

December 31,	2019		2018
Land and land rights, including mines	$	333	$	328
Structures (by type of operation):
Bauxite mining		1,138		1,119
Alumina refining		2,415		2,478
Aluminum smelting and casting		3,457		3,532
Energy generation		440		506
Aluminum rolling		290		285
Other		386		380
		8,126		8,300
Machinery and equipment (by type of operation):
Bauxite mining		499		480
Alumina refining		3,956		3,604
Aluminum smelting and casting		6,251		6,489
Energy generation		879		889
Aluminum rolling		1,057		1,029
Other		293		282
		12,935		12,773
		21,394		21,401
Less: accumulated depreciation, depletion, and amortization		13,799		13,480
		7,595		7,921
Construction work-in-progress		321		406
	$	7,916	$	8,327