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Cover Page - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2025
Feb. 09, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-3610    
Entity Registrant Name HOWMET AEROSPACE INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 25-0317820    
Entity Address, Address Line One 201 Isabella Street, Suite 200    
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 553-1940    
Title of 12(b) Security Common Stock, par value $1.00 per share    
Trading Symbol HWM    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 75
Entity Common Stock, Shares Outstanding   400,940,063  
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 2026 Annual Meeting of Shareholders to be filed pursuant to Regulation 14A (Proxy Statement).
   
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000004281