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Cover
Dec. 04, 2019
Dec. 01, 2019
Schedule of Capitalization, Equity [Line Items]    
Document Type   8-K
Amendment Flag false  
Document Period End Date   Dec. 04, 2019
Entity File Number   1-3610
Entity Registrant Name   ARCONIC INC.
Entity Central Index Key 0000004281  
Entity Tax Identification Number   25-0317820
Entity Incorporation, State or Country Code   DE
Entity Address, Address Line One   201 Isabella Street
Entity Address, Address Line Two   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
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Entity Emerging Growth Company   false
Common Stock    
Schedule of Capitalization, Equity [Line Items]    
Title of 12(b) Security   Common Stock, par value $1.00 per share
Trading Symbol   ARNC
Security Exchange Name   NYSE
Preferred Class A    
Schedule of Capitalization, Equity [Line Items]    
Title of 12(b) Security   $3.75 Cumulative Preferred Stock, par value $100 per share
Trading Symbol   ARNC PR
Security Exchange Name   NYSEAMER