v3.22.2.2
Segment and Related Information​ - Operating Results (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales $ 2,280 $ 1,890 $ 7,019 $ 5,366
Segment Adjusted EBITDA 147 182 577 571
Provision for depreciation and amortization 59 61 181 186
Intersegment sales        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 10 10 34 27
Intersegment sales | Rolled Products        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 10 9 33 26
Intersegment sales | Building and Construction Systems        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 0 0 0 0
Intersegment sales | Extrusions        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 0 1 1 1
Operating segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 2,290 1,900 7,053 5,393
Segment Adjusted EBITDA 147 182 577 571
Provision for depreciation and amortization 57 58 173 175
Operating segments | Rolled Products        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 1,871 1,568 5,811 4,423
Segment Adjusted EBITDA 111 155 461 493
Provision for depreciation and amortization 48 48 145 145
Operating segments | Building and Construction Systems        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 321 257 941 750
Segment Adjusted EBITDA 49 34 146 97
Provision for depreciation and amortization 4 4 13 13
Operating segments | Extrusions        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 98 75 301 220
Segment Adjusted EBITDA 13 7 30 19
Provision for depreciation and amortization 5 6 15 17
Third-party sales | External Sales Including Reconciling Items        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 2,280 1,890 7,019 5,366
Third-party sales | External Sales Including Reconciling Items | Rolled Products        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 1,861 1,559 5,778 4,397
Third-party sales | External Sales Including Reconciling Items | Building and Construction Systems        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales 321 257 941 750
Third-party sales | External Sales Including Reconciling Items | Extrusions        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total sales $ 98 $ 74 $ 300 $ 219