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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 16, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Trading Symbol AA    
Entity Registrant Name ALCOA CORP    
Entity Central Index Key 0001675149    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   179,558,990  
Entity Public Float     $ 6.0
Entity File Number 1-37816    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 81-1789115    
Entity Address, Address Line One 201 Isabella Street    
Entity Address, Address Line Two Suite 500    
Entity Address, City or Town Pittsburgh    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 15212-5858    
City Area Code 412    
Local Phone Number 315-2900    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Security Exchange Name NYSE    
Document Annual Report true    
Document Transition Report false    
Auditor Firm ID 238    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Pittsburgh, Pennsylvania    
Documents Incorporated by Reference

Part III of this Form 10-K incorporates by reference certain information from the registrant’s Definitive Proxy Statement for its 2024 Annual Meeting of Stockholders to be filed pursuant to Regulation 14A.