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Segment and Related Information - Schedule of Product Division Information (Detail)
12 Months Ended
Dec. 31, 2018
Bauxite [Member]  
Product Information [Line Items]  
Product division Bauxite
Pricing components Negotiated
Shipping terms FOB/CIF
Payment terms LC Sight
Alumina [Member] | Smelter-grade [Member]  
Product Information [Line Items]  
Product division Alumina: Smelter-grade
Pricing components API/spot
Shipping terms FOB
Payment terms LC Sight/CAD/Net 30 days
Alumina [Member] | Non-metallurgical [Member]  
Product Information [Line Items]  
Product division Alumina: Non-metallurgical
Pricing components Negotiated
Shipping terms FOB/CIF
Payment terms Net 30 days
Primary Aluminum [Member] | Common Alloy Ingot [Member]  
Product Information [Line Items]  
Product division Primary aluminum: Common alloy ingot
Pricing components LME + Regional premium
Shipping terms DAP/CIF
Payment terms Net 30 to 45 days
Primary Aluminum [Member] | Value-add Ingot [Member]  
Product Information [Line Items]  
Product division Primary aluminum: Value-add ingot
Pricing components LME + Regional premium + Product premium
Shipping terms DAP/CIF
Payment terms Net 30 to 45 days
Flat-Rolled Aluminum [Member]  
Product Information [Line Items]  
Product division Flat-rolled aluminum
Pricing components Metal + Conversion
Shipping terms DAP
Payment terms Negotiated