v3.22.4
Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
report
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2022
USD ($)
Goodwill [Line Items]          
Number of reporting units | report   3      
Carrying value of goodwill $ 322,000,000 $ 292,000,000 $ 322,000,000 $ 390,000,000  
Maximum period between quantitative goodwill impairment tests   3 years      
Goodwill impairment   $ 0 65,000,000 0  
Accumulated impairment losses $ 93,000,000 93,000,000 93,000,000 28,000,000  
Goodwill and Intangible Asset Impairment   0 65,000,000 0  
Weighted Average Cost of Capital, Basis Points 15000.00%        
Rolled Products          
Goodwill [Line Items]          
Carrying value of goodwill $ 253,000,000 224,000,000 253,000,000 254,000,000 $ 232,000,000
Goodwill impairment   0 0    
Accumulated impairment losses 0 0 0 0  
Building and Construction Systems          
Goodwill [Line Items]          
Carrying value of goodwill 69,000,000 68,000,000 69,000,000 71,000,000 $ 67,000,000
Goodwill impairment     0    
Accumulated impairment losses 28,000,000 28,000,000 28,000,000 28,000,000  
Extrusions          
Goodwill [Line Items]          
Carrying value of goodwill 0 0 0 65,000,000  
Goodwill impairment     65,000,000    
Accumulated impairment losses $ 65,000,000 65,000,000 $ 65,000,000 $ 0  
Financing Receivable          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Capacity   $ 250,000,000