v3.22.2.2
Cover Page - shares
 9 Months Ended
Sep. 30, 2022
Oct. 31, 2022
Cover [Abstract]    
Document Type 10-Q  
Document Period End Date Sep. 30, 2022  
Entity Registrant Name ARCONIC CORPORATION  
Entity Central Index Key 0001790982  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   101,484,590
Document Transition Report false  
Document Quarterly Report true  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 84-2745636  
Entity Address, Address Line One 201 Isabella Street,  
Entity Address, Address Line Two Suite 400,  
Entity Address, City or Town Pittsburgh,  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 15212-5872  
City Area Code 412)  
Local Phone Number 992-2500  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol ARNC  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity File Number 1-39162