v3.26.3
Segment Disclosures - Analysis and Reconciliation of Reportable Segment Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting Information [Line Items]        
Sales $ 1,687 $ 1,682 $ 5,120 $ 5,305
Consolidated other costs 1,679 1,642 5,208 5,269
Consolidated operating income (loss) 8 40 (88) 36
Interest expense, net 57 59 171 178
Non-service components of net periodic benefit cost (7) (6) (14) (13)
Loss before income taxes (42) (13) (245) (129)
Income tax (benefit) expense (10) 302 11 256
Net Income (Loss) (32) (315) (256) (385)
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Sales 1,718 1,712 5,200 5,380
Consolidated other costs 1,639 1,599 5,072 5,172
Operating Segments [Member] | Communication Papers [Member]        
Segment Reporting Information [Line Items]        
Sales 533 515 1,614 1,697
Operating Segments [Member] | Specialty and Packaging Papers [Member]        
Segment Reporting Information [Line Items]        
Sales 327 320 1,006 939
Operating Segments [Member] | Market Pulp [Member]        
Segment Reporting Information [Line Items]        
Sales 338 420 1,083 1,333
Operating Segments [Member] | Linerboard [Member]        
Segment Reporting Information [Line Items]        
Sales 89 65 240 179
Operating Segments [Member] | Newsprint [Member]        
Segment Reporting Information [Line Items]        
Sales 78 86 217 251
Operating Segments [Member] | Tissue [Member]        
Segment Reporting Information [Line Items]        
Sales 56 57 176 174
Operating Segments [Member] | Wood [Member]        
Segment Reporting Information [Line Items]        
Sales 266 219 784 732
Operating Segments [Member] | Paper And Packaging [Member]        
Segment Reporting Information [Line Items]        
Sales 891 907 2,712 2,809
Consolidated other costs 831 821 2,509 2,608
Consolidated operating income (loss) 52 79 183 178
Operating Segments [Member] | Pulp and Tissue [Member]        
Segment Reporting Information [Line Items]        
Sales 560 586 1,702 1,839
Consolidated other costs 539 538 1,775 1,819
Consolidated operating income (loss) (1) 25 (131) (32)
Operating Segments [Member] | Wood Products [Member]        
Segment Reporting Information [Line Items]        
Sales 267 219 786 732
Consolidated other costs 269 240 788 745
Consolidated operating income (loss) (3) (21) (4) (13)
Intersegment Sales [Member]        
Segment Reporting Information [Line Items]        
Sales (31) (30) (80) (75)
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Consolidated other costs 40 43 136 97
Consolidated operating income (loss) $ (40) $ (43) $ (136) $ (97)