v3.20.1
Cover Page - shares
3 Months Ended
Mar. 31, 2020
May 15, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Period End Date Mar. 31, 2020  
Entity Registrant Name ARCONIC CORPORATION  
Entity Central Index Key 0001790982  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Filer Category Non-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   109,052,877