| Segment Reporting [Table Text Block] |
| | | Light | | | Commercial | | | | | | | | | |
| Three months ended June 30, 2026 | | Vehicle | | | Vehicle | | | Corporate | | | Total | |
| External sales | | $ | 1,379 | | | $ | 631 | | | | | | | $ | 2,010 | |
| Inter-segment sales | | | 26 | | | | 17 | | | | | | | | 43 | |
| | | | 1,405 | | | | 648 | | | | | | | | 2,053 | |
| Reconciliation of sales | | | | | | | | | | | | | | | | |
| Elimination of inter-segment sales | | | | | | | | | | | | | | | (43 | ) |
| Total consolidated sales | | | | | | | | | | | | | | $ | 2,010 | |
| Less: | | | | | | | | | | | | | | | | |
| Cost of sales | | | 1,215 | | | | 538 | | | | | | | | | |
| Selling, general and administrative expenses | | | 41 | | | | 38 | | | | | | | | | |
| Other segment items (a) | | | (6 | ) | | | (4 | ) | | | | | | | | |
| Segment EBITDA | | $ | 143 | | | $ | 68 | | | | | | | $ | 211 | |
| | | | | | | | | | | | | | | | | |
| Purchases of property, plant and equipment | | $ | 42 | | | $ | 97 | | | $ | 3 | | | $ | 142 | |
| Segment net assets (b) - June 30, 2026 | | $ | 573 | | | $ | 465 | | | $ | (72 | ) | | $ | 966 | |
| | | Light | | | Commercial | | | | | | | | | |
| Three months ended June 30, 2025 | | Vehicle | | | Vehicle | | | Corporate | | | Total | |
| External sales | | $ | 1,335 | | | $ | 600 | | | | | | | $ | 1,935 | |
| Inter-segment sales | | | 35 | | | | 19 | | | | | | | | 54 | |
| | | | 1,370 | | | | 619 | | | | | | | | 1,989 | |
| Reconciliation of sales | | | | | | | | | | | | | | | | |
| Elimination of inter-segment sales | | | | | | | | | | | | | | | (54 | ) |
| Total consolidated sales | | | | | | | | | | | | | | $ | 1,935 | |
| Less: | | | | | | | | | | | | | | | | |
| Cost of sales | | | 1,218 | | | | 536 | | | | | | | | | |
| Selling, general and administrative expenses | | | 42 | | | | 34 | | | | | | | | | |
| Other segment items (a) | | | 2 | | | | (2 | ) | | | | | | | | |
| Segment EBITDA | | $ | 112 | | | $ | 47 | | | | | | | $ | 159 | |
| | | | | | | | | | | | | | | | | |
| Purchases of property, plant and equipment | | $ | 30 | | | $ | 4 | | | $ | 3 | | | $ | 37 | |
| Segment net assets (b) - December 31, 2025 | | $ | 465 | | | $ | 471 | | | $ | (88 | ) | | $ | 848 | |
| | | Light | | | Commercial | | | | | | | | | |
| Six months ended June 30, 2026 | | Vehicle | | | Vehicle | | | Corporate | | | Total | |
| External sales | | $ | 2,648 | | | $ | 1,230 | | | | | | | $ | 3,878 | |
| Inter-segment sales | | | 52 | | | | 32 | | | | | | | | 84 | |
| | | | 2,700 | | | | 1,262 | | | | | | | | 3,962 | |
| Reconciliation of sales | | | | | | | | | | | | | | | | |
| Elimination of inter-segment sales | | | | | | | | | | | | | | | (84 | ) |
| Total consolidated sales | | | | | | | | | | | | | | $ | 3,878 | |
| Less: | | | | | | | | | | | | | | | | |
| Cost of sales | | | 2,359 | | | | 1,051 | | | | | | | | | |
| Selling, general and administrative expenses | | | 79 | | | | 74 | | | | | | | | | |
| Other segment items (a) | | | (7 | ) | | | (6 | ) | | | | | | | | |
| Segment EBITDA | | $ | 255 | | | $ | 131 | | | | | | | $ | 386 | |
| | | | | | | | | | | | | | | | | |
| Purchases of property, plant and equipment | | $ | 89 | | | $ | 108 | | | $ | 7 | | | $ | 204 | |
| | | Light | | | Commercial | | | | | | | | | |
| Six months ended June 30, 2025 | | Vehicle | | | Vehicle | | | Corporate | | | Total | |
| External sales | | $ | 2,548 | | | $ | 1,168 | | | | | | | $ | 3,716 | |
| Inter-segment sales | | | 71 | | | | 42 | | | | | | | | 113 | |
| | | | 2,619 | | | | 1,210 | | | | | | | | 3,829 | |
| Reconciliation of sales | | | | | | | | | | | | | | | | |
| Elimination of inter-segment sales | | | | | | | | | | | | | | | (113 | ) |
| Total consolidated sales | | | | | | | | | | | | | | $ | 3,716 | |
| Less: | | | | | | | | | | | | | | | | |
| Cost of sales | | | 2,356 | | | | 1,052 | | | | | | | | | |
| Selling, general and administrative expenses | | | 85 | | | | 69 | | | | | | | | | |
| Other segment items (a) | | | 2 | | | | (1 | ) | | | | | | | | |
| Segment EBITDA | | $ | 180 | | | $ | 88 | | | | | | | $ | 268 | |
| | | | | | | | | | | | | | | | | |
| Purchases of property, plant and equipment | | $ | 79 | | | $ | 16 | | | $ | 9 | | | $ | 104 | |
|
| Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] |
| | | Three Months Ended | | | Six Months Ended | |
| | | June 30, | | | June 30, | |
| | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| Segment EBITDA | | $ | 211 | | | $ | 159 | | | $ | 386 | | | $ | 268 | |
| Corporate expense and other items, net | | | (4 | ) | | | (12 | ) | | | (8 | ) | | | (28 | ) |
| Depreciation | | | (82 | ) | | | (89 | ) | | | (166 | ) | | | (171 | ) |
| Amortization | | | (2 | ) | | | (3 | ) | | | (5 | ) | | | (6 | ) |
| Non-service cost components of pension and OPEB costs | | | (3 | ) | | | (2 | ) | | | (4 | ) | | | (4 | ) |
| Restructuring charges, net | | | (9 | ) | | | (11 | ) | | | (15 | ) | | | (13 | ) |
| Stock compensation expense | | | (8 | ) | | | (10 | ) | | | (19 | ) | | | (23 | ) |
| Strategic transaction expenses | | | (19 | ) | | | (5 | ) | | | (20 | ) | | | (6 | ) |
| Gain on sale of property, plant and equipment | | | | | | | | | | | | | | | 1 | |
| Supplier capacity charge adjustment | | | | | | | | | | | | | | | 19 | |
| Amounts attributable to previously closed/divested operations | | | (1 | ) | | | | | | | (1 | ) | | | | |
| Distressed supplier costs | | | (2 | ) | | | | | | | (2 | ) | | | | |
| Loss on divestiture of ownership interests | | | | | | | (7 | ) | | | (8 | ) | | | (7 | ) |
| Electric vehicle program termination charges | | | (8 | ) | | | | | | | (64 | ) | | | | |
| Foreign exchange gain on unhedged intercompany loans | | | 2 | | | | | | | | 23 | | | | | |
| Other items | | | 1 | | | | (4 | ) | | | (2 | ) | | | (6 | ) |
| Earnings from continuing operations before interest and income taxes | | | 76 | | | | 16 | | | | 95 | | | | 24 | |
| Loss on extinguishment of debt | | | | | | | | | | | (7 | ) | | | | |
| Interest income | | | 4 | | | | 3 | | | | 10 | | | | 5 | |
| Interest expense | | | 21 | | | | 44 | | | | 43 | | | | 83 | |
| Earnings (loss) from continuing operations before income taxes | | $ | 59 | | | $ | (25 | ) | | $ | 55 | | | $ | (54 | ) |
|
| Segment Reporting, Reconciliation of Asset by Segment to Consolidated [Table Text Block] |
| | | June 30, | | | | December 31, | |
| | | 2026 | | | 2025 | |
| Segment net assets | | $ | 966 | | | $ | 848 | |
| Accounts payable | | | 1,301 | | | | 1,154 | |
| Cash and cash equivalents | | | 331 | | | | 469 | |
| Accounts receivable - Other | | | 286 | | | | 254 | |
| Other current assets | | | 285 | | | | 114 | |
| Current assets of disposal group held for sale | | | 36 | | | | 1,029 | |
| Intangibles | | | 58 | | | | 71 | |
| Deferred tax assets | | | 495 | | | | 534 | |
| Other noncurrent assets | | | 114 | | | | 102 | |
| Investment in affiliates | | | 112 | | | | 102 | |
| Operating lease assets | | | 166 | | | | 305 | |
| Property, plant and equipment, net | | | 1,942 | | | | 1,872 | |
| Noncurrent assets of disposal group held for sale | | | 21 | | | | 954 | |
| Total assets | | $ | 6,113 | | | $ | 7,808 | |
|