v3.20.2
Segment and Related Information​ - Operating Results (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales $ 1,415 $ 1,805 $ 4,213 $ 5,569
Segment Adjusted EBITDA (172) (191) (483) (589)
Provision for depreciation and amortization 63 63 191 190
Restructuring and other charges 3 64 61 104
Net Income (Loss) Attributable to Parent 5 (24) (45) 9
Rolled Products [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 1,092 1,397 3,194 4,294
Segment Adjusted EBITDA (138) (160) (388) (499)
Provision for depreciation and amortization 48 46 147 139
Restructuring and other charges 1 61 15 69
Extrusions [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 82 126 296 420
Segment Adjusted EBITDA (6) (8) (12) (6)
Provision for depreciation and amortization 6 7 18 22
Restructuring and other charges 1 1 27 1
Building and Construction Systems [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 241 282 727 855
Segment Adjusted EBITDA (40) (39) (107) (96)
Provision for depreciation and amortization 5 4 14 14
Restructuring and other charges 0 2 6 31
Operating segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 1,419 1,810 4,232 5,590
Segment Adjusted EBITDA (172) (191) (483) (589)
Provision for depreciation and amortization 59 57 179 175
Restructuring and other charges 0 62 6 99
Operating segments | Rolled Products [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 1,095 1,401 3,208 4,314
Operating segments | Extrusions [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 83 127 297 421
Operating segments | Building and Construction Systems [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 241 282 727 855
Intersegment sales        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 4 5 15 21
Intersegment sales | Rolled Products [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 3 4 14 20
Intersegment sales | Extrusions [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 1 1 1 1
Intersegment sales | Building and Construction Systems [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 0 0 0 0
Sales to unrelated parties        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 1,391 1,764 4,132 5,427
Sales to unrelated parties | Rolled Products [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 1,073 1,366 3,144 4,193
Sales to unrelated parties | Extrusions [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 77 116 265 379
Sales to unrelated parties | Building and Construction Systems [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 241 282 727 855
Sales to unrelated parties | Operating segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 1,391 1,764 4,136 5,427
Sales to related parties        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 24 41 81 142
Sales to related parties | Rolled Products [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 19 31 50 101
Sales to related parties | Extrusions [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 5 10 31 41
Sales to related parties | Building and Construction Systems [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 0 0 0 0
Sales to related parties | Operating segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales $ 24 $ 41 $ 81 $ 142