v3.22.2.2
Restructuring and Other Charges - Restructuring Reserve (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2020
Restructuring Reserve [Roll Forward]          
Beginning balance     $ 3 $ 14  
Cash payments     (5)   $ (15)
Restructuring charges     4   9
Other     (1)   (5)
Ending balance $ 1   1   14
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (112) $ (14) (119) (612)  
Environmental remediation, payments 1   7    
Fusina, Italy          
Restructuring Reserve [Roll Forward]          
Environmental remediation, payments     1    
2021 Restructuring Programs          
Restructuring Reserve [Roll Forward]          
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business   (14)   (612)  
2022 Restructuring Programs          
Restructuring Reserve [Roll Forward]          
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (112)   (119)    
Extrusions          
Restructuring Reserve [Roll Forward]          
Impairment of Intangible Assets, Finite-Lived 2        
Operating segments          
Restructuring Reserve [Roll Forward]          
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (91) (3) (93) (6)  
Operating segments | Rolled Products          
Restructuring Reserve [Roll Forward]          
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business 1 0 1 (1)  
Operating segments | Building and Construction Systems          
Restructuring Reserve [Roll Forward]          
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (2) 0 (2) 1  
Operating segments | Extrusions          
Restructuring Reserve [Roll Forward]          
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (88) 3 (90) 6  
Corporate, Non-Segment          
Restructuring Reserve [Roll Forward]          
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (21) (11) (26) (606)  
Other costs          
Restructuring Reserve [Roll Forward]          
Beginning balance     1 1  
Cash payments     (2)   (5)
Restructuring charges     2   6
Other     (1)   (1)
Ending balance 0   0   1
Other costs | 2021 Restructuring Programs          
Restructuring Reserve [Roll Forward]          
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business   $ (1)   (2)  
Other costs | 2022 Restructuring Programs          
Restructuring Reserve [Roll Forward]          
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (5)   (5)    
Layoff costs          
Restructuring Reserve [Roll Forward]          
Beginning balance     2 $ 13  
Cash payments     (3)   (10)
Restructuring charges     2   3
Other     0   (4)
Ending balance $ 1   $ 1   $ 13