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Cover Page - shares | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Nov. 01, 2019
Entity Information [Line Items] |  |
Document Type | 10-Q |
Document Quarterly Report | true |
Document Period End Date | Sep. 30, 2019 |
Document Transition Report | false |
Entity File Number | 1-3610 |
Entity Registrant Name | ARCONIC INC. |
Entity Incorporation, State or Country Code | DE |
Entity Tax Identification Number | 25-0317820 |
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 |
Entity Current Reporting Status | Yes |
Entity Interactive Data Current | Yes |
Entity Common Stock, Shares Outstanding |  | 432,941,063
Entity Filer Category | Large Accelerated Filer |
Entity Small Business | false |
Entity Emerging Growth Company | false |
Entity Shell Company | false |
Amendment Flag | false |
Document Fiscal Year Focus | 2019 |
Document Fiscal Period Focus | Q3 |
Entity Central Index Key | 0000004281 |
Current Fiscal Year End Date | --12-31 |
Common stock |  |
Entity Information [Line Items] |  |
Title of 12(b) Security | Common Stock, par value $1.00 per share |
Trading Symbol | ARNC |
Security Exchange Name | NYSE |
Preferred stock |  |
Entity Information [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 |

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