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Basis of Presentation - Additional Information (Detail)
Dec. 31, 2024
Location
Country
Jul. 31, 2024
Basis Of Presentation [Line Items]    
Number of countries in which entity operates | Country 9  
AWAC [Member] | Alcoa Corporation [Member]    
Basis Of Presentation [Line Items]    
Ownership interest percentage   60.00%
Minimum [Member]    
Basis Of Presentation [Line Items]    
Number of operating locations | Location 26  
Maximum [Member]    
Basis Of Presentation [Line Items]    
Percent of equity interest in other entity 50.00%