v3.20.2
Segment and Related Information​ - Operating Results (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales $ 1,187 $ 1,923 $ 2,798 $ 3,764
Segment Adjusted EBITDA (103) (223) (320) (393)
Provision for depreciation and amortization 68 64 128 127
Restructuring and other charges 77 38 58 40
Net Income (Loss) Attributable to Parent (92) 5 (32) 46
Rolled Products [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 880 1,486 2,102 2,897
Segment Adjusted EBITDA (78) (185) (251) (325)
Provision for depreciation and amortization 53 46 99 93
Restructuring and other charges 7 2 16 8
Extrusions [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 81 145 214 294
Segment Adjusted EBITDA 13 0 1 (3)
Provision for depreciation and amortization 6 8 12 15
Restructuring and other charges 3 0 28 0
Building and Construction Systems [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 230 292 486 573
Segment Adjusted EBITDA 38 (38) 70 (65)
Provision for depreciation and amortization 5 5 9 10
Restructuring and other charges 5 24 6 29
Operating segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 1,195 1,932 2,813 3,780
Segment Adjusted EBITDA (103) (223) (320) (393)
Provision for depreciation and amortization 64 59 120 118
Restructuring and other charges 15 26 6 37
Operating segments | Rolled Products [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 884 1,495 2,113 2,913
Operating segments | Extrusions [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 81 145 214 294
Operating segments | Building and Construction Systems [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 230 292 486 573
Intersegment sales        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 4 9 11 16
Intersegment sales | Rolled Products [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 4 9 11 16
Intersegment sales | Extrusions [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 0 0 0 0
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 1,165 1,874 2,741 3,663
Sales to unrelated parties | Rolled Products [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 870 1,451 2,071 2,827
Sales to unrelated parties | Extrusions [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 69 131 188 263
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 230 292 486 573
Sales to unrelated parties | Operating segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 1,169 1,874 2,745 3,663
Sales to related parties        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 22 49 57 101
Sales to related parties | Rolled Products [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 10 35 31 70
Sales to related parties | Extrusions [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total Sales 12 14 26 31
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 $ 22 $ 49 $ 57 $ 101