v3.22.1
Restructuring and Other Charges - Restructuring Reserve (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Restructuring Reserve [Roll Forward]      
Beginning balance $ 3 $ 14 $ 14
Cash payments (2)   (15)
Restructuring charges 1   9
Other (1)   (5)
Ending balance 1   3
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (5) (1)  
Operating segments      
Restructuring Reserve [Roll Forward]      
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (1) (1)  
Operating segments | Rolled Products      
Restructuring Reserve [Roll Forward]      
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business 0 (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 0 1  
Operating segments | Extrusions      
Restructuring Reserve [Roll Forward]      
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (1) 1  
Corporate, Non-Segment      
Restructuring Reserve [Roll Forward]      
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business (4) 0  
Other costs      
Restructuring Reserve [Roll Forward]      
Beginning balance 1 1 1
Cash payments (1)   (5)
Restructuring charges 1   6
Other (1)   (1)
Ending balance 0   1
Other costs | 2020 Restructuring Programs      
Restructuring Reserve [Roll Forward]      
Restructuring, Settlement And Impairment Provisions, Including Gain (Loss) On Disposition Of Assets And Business   (1)  
Layoff costs      
Restructuring Reserve [Roll Forward]      
Beginning balance 2 $ 13 13
Cash payments (1)   (10)
Restructuring charges 0   3
Other 0   (4)
Ending balance $ 1   $ 2