Properties, Plants, and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2021

Property Plant And Equipment [Abstract]

Schedule of Properties, Plants, and Equipment, Net

December 31,	2021		2020
Land and land rights, including mines	$	264	$	320
Structures (by type of operation):
Bauxite mining		1,148		1,119
Alumina refining		2,400		2,474
Aluminum smelting and casting		3,298		3,447
Energy generation		339		360
Other		340		350
		7,525		7,750
Machinery and equipment (by type of operation):
Bauxite mining		565		517
Alumina refining		3,946		4,180
Aluminum smelting and casting		5,877		6,111
Energy generation		836		844
Other		452		465
		11,676		12,117
		19,465		20,187
Less: accumulated depreciation, depletion, and amortization		13,130		13,332
		6,335		6,855
Construction work-in-progress		288		335
	$	6,623	$	7,190