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Contingencies and Commitments - Commitments (Details) - USD ($)
$ in Millions
1 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]      
Purchase obligations due in 2023 $ 265    
Purchase obligations due in 2024 140    
Purchase obligations due in 2025 14    
Purchase obligations due in 2026 2    
Purchase obligations due in 2027 0    
Purchase obligations due thereafter 0    
Guarantees of third party related to project financing 13    
Combined fair value of guarantees 6    
Insurance annual coverage limit 80 $ 80 $ 80
Total amount committed under outstanding surety bonds 43    
Amount of outstanding surety bonds relating to these liabilities 22    
Alcoa Corporation Workers Compensation Claims      
Loss Contingencies [Line Items]      
Letters of credit, total amount committed 53    
Arconic Corporation Environmental Obligations      
Loss Contingencies [Line Items]      
Letters of credit, total amount committed 17    
Bank Loan Obligations      
Loss Contingencies [Line Items]      
Letters of credit 120    
Separation Agreement | Other Noncurrent Liabilities and Deferred Credits      
Loss Contingencies [Line Items]      
Guarantees of third party related to project financing $ 1,040 $ 1,406