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Segment Information - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2019
segment
Sep. 30, 2018
USD ($)
Segment Reporting Information [Line Items]          
Number of operating and reportable segments | segment       2  
Amount related to settlements of certain customer claims         $ 38
Engineered Products and Forgings          
Segment Reporting Information [Line Items]          
Long lived asset impairment charge   $ 428      
AWTP          
Segment Reporting Information [Line Items]          
Goodwill, amount reallocated due to restructuring $ 7        
BCS          
Segment Reporting Information [Line Items]          
Goodwill, amount reallocated due to restructuring 68        
Arconic Engines          
Segment Reporting Information [Line Items]          
Goodwill, amount reallocated due to restructuring   105      
Long lived asset impairment charge $ 428        
Aluminum Extrusions          
Segment Reporting Information [Line Items]          
Goodwill, amount reallocated due to restructuring     $ 110    
Arconic Engineered Structures          
Segment Reporting Information [Line Items]          
Goodwill, amount reallocated due to restructuring   $ (105) $ (110)