v3.26.1
Segment Information - Schedule of Reportable Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Net Sales $ 2,188 $ 2,204 $ 4,344 $ 4,324
Cost of Sales 1,896 1,784 3,746 3,459
Selling, General and Administrative 180 204 382 400
Other 17 23 102 51
Income (Loss) from Operations 95 193 114 414
Segment Reporting, Long-Lived Asset, Expenditure for Addition 83 228 223 541
Other Segment Information        
Depreciation and Amortization 145 130 284 261
Operating Segments        
Segment Reporting [Line Items]        
Income (Loss) from Operations 117 216 245 484
Operating Segments | Americas Paperboard Packaging        
Segment Reporting [Line Items]        
Net Sales 1,487 1,511 2,951 2,987
Cost of Sales 1,291 1,226 2,527 2,367
Selling, General and Administrative 78 90 168 184
Other 8 8 16 21
Income (Loss) from Operations 110 187 240 415
Segment Reporting, Long-Lived Asset, Expenditure for Addition 12 29 28 48
Other Segment Information        
Depreciation and Amortization 39 39 78 82
Operating Segments | International Paperboard Packaging        
Segment Reporting [Line Items]        
Net Sales 579 560 1,142 1,083
Cost of Sales 498 460 986 881
Selling, General and Administrative 63 65 130 126
Other 11 6 21 7
Income (Loss) from Operations 7 29 5 69
Segment Reporting, Long-Lived Asset, Expenditure for Addition 9 18 34 42
Other Segment Information        
Depreciation and Amortization 36 31 70 60
Corporate and Other        
Segment Reporting [Line Items]        
Net Sales 122 133 251 254
Cost of Sales 107 98 233 211
Selling, General and Administrative 39 49 84 90
Other (2) 9 65 23
Income (Loss) from Operations (22) (23) (131) (70)
Segment Reporting, Long-Lived Asset, Expenditure for Addition 62 181 161 451
Other Segment Information        
Depreciation and Amortization $ 70 $ 60 $ 136 $ 119