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Segment and Geographic Area Information Segment Information - Schedule of Operating Results of Arconic's Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) | $ 3,401 | $ 3,559 | $ 3,691 | $ 3,541 | $ 3,472 | $ 3,524 | $ 3,573 | $ 3,445 | $ 14,192 | $ 14,014 | $ 12,960
Engineered Products and Forgings |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 7,105 | 6,798 | 6,300
Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 7,082 | 7,223 | 6,540
Transportation and Construction Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 14,187 | 14,021 | 12,840
Aerospace | Engineered Products and Forgings |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 5,075 | 4,722 | 4,347
Aerospace | Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 1,251 | 1,116 | 1,109
Aerospace | Transportation and Construction Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 6,326 | 5,838 | 5,456
Transportation | Engineered Products and Forgings |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 1,289 | 1,302 | 1,098
Transportation | Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 2,418 | 2,550 | 2,072
Transportation | Transportation and Construction Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 3,707 | 3,852 | 3,170
Building and construction | Engineered Products and Forgings |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Building and construction | Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 1,300 | 1,357 | 1,269
Building and construction | Transportation and Construction Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 1,300 | 1,357 | 1,269
Industrial and Other | Engineered Products and Forgings |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 741 | 774 | 855
Industrial and Other | Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 2,113 | 2,200 | 2,090
Industrial and Other | Transportation and Construction Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 2,854 | 2,974 | 2,945
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | (183) | (205) | (183)
Intersegment Eliminations | Engineered Products and Forgings |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment Eliminations | Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B) |  |  |  |  |  |  |  |  | $ (183) | $ (205) | $ (183)

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