| Segment Reporting [Table Text Block] |
| | | Three months ended March 31, 2026 | |
| | | Polyurethanes | | | Performance Products | | | Advanced Materials | | | Total | |
| Revenues: | | | | | | | | | | | | | | | | |
| Reportable segments’ revenues(1) | | $ | 923 | | | $ | 228 | | | $ | 279 | | | $ | 1,430 | |
| | | | | | | | | | | | | | | | | |
| Significant segment expenses: | | | | | | | | | | | | | | | | |
| Variable direct costs(2) | | | 698 | | | | 126 | | | | 131 | | | | 955 | |
| Adjusted fixed costs(3) | | | 185 | | | | 77 | | | | 108 | | | | 370 | |
| Other segment items(4) | | | 1 | | | | (1 | ) | | | (5 | ) | | | (5 | ) |
| Total reportable segments’ adjusted EBITDA(5) | | $ | 39 | | | $ | 26 | | | $ | 45 | | | | 110 | |
| | | | | | | | | | | | | | | | | |
| Reconciliation of total reportable segments’ adjusted EBITDA to loss from continuing operations before income taxes: | | | | | | | | | | | | | | | | |
| Interest expense, net | | | | | | | | | | | | | | | (21 | ) |
| Depreciation and amortization | | | | | | | | | | | | | | | (73 | ) |
| Corporate and other costs, net(6) | | | | | | | | | | | | | | | (37 | ) |
| Net income attributable to noncontrolling interests | | | | | | | | | | | | | | | 12 | |
| Other adjustments: | | | | | | | | | | | | | | | | |
| Certain legal and other settlements and related expenses, net | | | | | | | | | | | | | | | (4 | ) |
| Loss on early extinguishment of debt | | | | | | | | | | | | | | | (1 | ) |
| Amortization of pension and postretirement actuarial losses | | | | | | | | | | | | | | | (7 | ) |
| Restructuring, impairment and plant closing and transition costs(7) | | | | | | | | | | | | | | | (8 | ) |
| Loss from continuing operations before income taxes | | | | | | | | | | | | | | | (29 | ) |
| | | | | | | | | | | | | | | | | |
| Income tax expense—continuing operations | | | | | | | | | | | | | | | (11 | ) |
| Loss from discontinued operations, net of tax | | | | | | | | | | | | | | | (1 | ) |
| Net loss | | | | | | | | | | | | | | $ | (41 | ) |
| | | Three months ended March 31, 2025 | |
| | | Polyurethanes | | | Performance Products | | | Advanced Materials | | | Total | |
| Revenues: | | | | | | | | | | | | | | | | |
| Reportable segments’ revenues(1) | | $ | 912 | | | $ | 257 | | | $ | 249 | | | $ | 1,418 | |
| | | | | | | | | | | | | | | | | |
| Significant segment expenses: | | | | | | | | | | | | | | | | |
| Variable direct costs(2) | | | 682 | | | | 137 | | | | 116 | | | | 935 | |
| Adjusted fixed costs(3) | | | 186 | | | | 84 | | | | 101 | | | | 371 | |
| Other segment items(4) | | | 2 | | | | 6 | | | | (4 | ) | | | 4 | |
| Total reportable segments’ adjusted EBITDA(5) | | $ | 42 | | | $ | 30 | | | $ | 36 | | | | 108 | |
| | | | | | | | | | | | | | | | | |
| Reconciliation of total reportable segments’ adjusted EBITDA to income from continuing operations before income taxes: | | | | | | | | | | | | | | | | |
| Interest expense, net | | | | | | | | | | | | | | | (19 | ) |
| Depreciation and amortization | | | | | | | | | | | | | | | (69 | ) |
| Corporate and other costs, net(6) | | | | | | | | | | | | | | | (36 | ) |
| Net income attributable to noncontrolling interests | | | | | | | | | | | | | | | 16 | |
| Other adjustments: | | | | | | | | | | | | | | | | |
| Business acquisition and integration gain and purchase accounting adjustments, net | | | | | | | | | | | | | | | 5 | |
| Certain legal and other settlements and related income, net(8) | | | | | | | | | | | | | | | 33 | |
| Amortization of pension and postretirement actuarial losses | | | | | | | | | | | | | | | (7 | ) |
| Restructuring, impairment and plant closing and transition costs(7) | | | | | | | | | | | | | | | (4 | ) |
| Income from continuing operations before income taxes | | | | | | | | | | | | | | | 27 | |
| | | | | | | | | | | | | | | | | |
| Income tax expense—continuing operations | | | | | | | | | | | | | | | (15 | ) |
| Loss from discontinued operations, net of tax | | | | | | | | | | | | | | | (1 | ) |
| Net income | | | | | | | | | | | | | | $ | 11 | |
| | | Three months ended March 31, 2026 | |
| | | Polyurethanes | | | Performance Products | | | Advanced Materials | | | Total | |
| Revenues: | | | | | | | | | | | | | | | | |
| Reportable segments’ revenues(1) | | $ | 923 | | | $ | 228 | | | $ | 279 | | | $ | 1,430 | |
| | | | | | | | | | | | | | | | | |
| Significant segment expenses: | | | | | | | | | | | | | | | | |
| Variable direct costs(2) | | | 698 | | | | 126 | | | | 131 | | | | 955 | |
| Adjusted fixed costs(3) | | | 185 | | | | 77 | | | | 108 | | | | 370 | |
| Other segment items(4) | | | 1 | | | | (1 | ) | | | (5 | ) | | | (5 | ) |
| Total reportable segments’ adjusted EBITDA(5) | | $ | 39 | | | $ | 26 | | | $ | 45 | | | | 110 | |
| | | | | | | | | | | | | | | | | |
| Reconciliation of total reportable segments’ adjusted EBITDA to loss from continuing operations before income taxes: | | | | | | | | | | | | | | | | |
| Interest expense, net | | | | | | | | | | | | | | | (21 | ) |
| Depreciation and amortization | | | | | | | | | | | | | | | (73 | ) |
| Corporate and other costs, net(6) | | | | | | | | | | | | | | | (35 | ) |
| Net income attributable to noncontrolling interests | | | | | | | | | | | | | | | 12 | |
| Other adjustments: | | | | | | | | | | | | | | | | |
| Certain legal and other settlements and related expenses, net | | | | | | | | | | | | | | | (4 | ) |
| Loss on early extinguishment of debt | | | | | | | | | | | | | | | (1 | ) |
| Amortization of pension and postretirement actuarial losses | | | | | | | | | | | | | | | (7 | ) |
| Restructuring, impairment and plant closing and transition costs(7) | | | | | | | | | | | | | | | (8 | ) |
| Loss from continuing operations before income taxes | | | | | | | | | | | | | | | (27 | ) |
| | | | | | | | | | | | | | | | | |
| Income tax expense—continuing operations | | | | | | | | | | | | | | | (11 | ) |
| Loss from discontinued operations, net of tax | | | | | | | | | | | | | | | (1 | ) |
| Net loss | | | | | | | | | | | | | | $ | (39 | ) |
| | | Three months ended March 31, 2025 | |
| | | Polyurethanes | | | Performance Products | | | Advanced Materials | | | Total | |
| Revenues: | | | | | | | | | | | | | | | | |
| Reportable segments’ revenues(1) | | $ | 912 | | | $ | 257 | | | $ | 249 | | | $ | 1,418 | |
| | | | | | | | | | | | | | | | | |
| Significant segment expenses: | | | | | | | | | | | | | | | | |
| Variable direct costs(2) | | | 682 | | | | 137 | | | | 116 | | | | 935 | |
| Adjusted fixed costs(3) | | | 186 | | | | 84 | | | | 101 | | | | 371 | |
| Other segment items(4) | | | 2 | | | | 6 | | | | (4 | ) | | | 4 | |
| Total reportable segments’ adjusted EBITDA(5) | | $ | 42 | | | $ | 30 | | | $ | 36 | | | | 108 | |
| | | | | | | | | | | | | | | | | |
| Reconciliation of total reportable segments’ adjusted EBITDA to income from continuing operations before income taxes: | | | | | | | | | | | | | | | | |
| Interest expense, net | | | | | | | | | | | | | | | (19 | ) |
| Depreciation and amortization | | | | | | | | | | | | | | | (69 | ) |
| Corporate and other costs, net(6) | | | | | | | | | | | | | | | (34 | ) |
| Net income attributable to noncontrolling interests | | | | | | | | | | | | | | | 16 | |
| Other adjustments: | | | | | | | | | | | | | | | | |
| Business acquisition and integration gain and purchase accounting adjustments, net | | | | | | | | | | | | | | | 5 | |
| Certain legal and other settlements and related income, net(8) | | | | | | | | | | | | | | | 33 | |
| Amortization of pension and postretirement actuarial losses | | | | | | | | | | | | | | | (7 | ) |
| Restructuring, impairment and plant closing and transition costs(7) | | | | | | | | | | | | | | | (4 | ) |
| Income from continuing operations before income taxes | | | | | | | | | | | | | | | 29 | |
| | | | | | | | | | | | | | | | | |
| Income tax expense—continuing operations | | | | | | | | | | | | | | | (17 | ) |
| Loss from discontinued operations, net of tax | | | | | | | | | | | | | | | (1 | ) |
| Net income | | | | | | | | | | | | | | $ | 11 | |
| |
|
March 31, |
|
|
December 31, |
|
| |
|
2026 |
|
|
2025 |
|
| Total assets: |
|
|
|
|
|
|
|
|
| Polyurethanes |
|
$ |
4,138 |
|
|
$ |
4,045 |
|
| Performance Products |
|
|
1,180 |
|
|
|
1,185 |
|
| Advanced Materials |
|
|
1,118 |
|
|
|
1,095 |
|
| Total reportable segments’ total assets |
|
|
6,436 |
|
|
|
6,325 |
|
| Corporate and other |
|
|
695 |
|
|
|
690 |
|
| Total |
|
$ |
7,131 |
|
|
$ |
7,015 |
|
| |
|
Three months ended |
| |
|
March 31, |
| |
|
2026 |
|
|
2025 |
|
| Depreciation and amortization: |
|
|
|
|
|
|
|
|
| Polyurethanes |
|
$ |
43 |
|
|
$ |
39 |
|
| Performance Products |
|
|
16 |
|
|
|
15 |
|
| Advanced Materials |
|
|
12 |
|
|
|
13 |
|
| Total reportable segments’ depreciation and amortization |
|
|
71 |
|
|
|
67 |
|
| Corporate and other |
|
|
2 |
|
|
|
2 |
|
| Total |
|
$ |
73 |
|
|
$ |
69 |
|
| |
|
Three months ended |
| |
|
March 31, |
| |
|
2026 |
|
|
2025 |
|
| Capital expenditures: |
|
|
|
|
|
|
|
|
| Polyurethanes |
|
$ |
21 |
|
|
$ |
17 |
|
| Performance Products |
|
|
8 |
|
|
|
14 |
|
| Advanced Materials |
|
|
8 |
|
|
|
4 |
|
| Total reportable segments’ capital expenditures |
|
|
37 |
|
|
|
35 |
|
| Corporate and other |
|
|
1 |
|
|
|
1 |
|
| Total |
|
$ |
38 |
|
|
$ |
36 |
|
|