Restructuring and Other Charges - Schedule of Liability Balance for Restructuring Plan (Details) - USD ($) $ in Millions |
6 Months Ended | 9 Months Ended | |
|---|---|---|---|
Jun. 30, 2026 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Restructuring Reserve [Roll Forward] | |||
| Balance at beginning of period | $ 28 | $ 28 | $ 0 |
| Changes in Reserves | 13 | 78 | |
| Cash Payments | (35) | (57) | |
| Foreign currency translation and other | 0 | 2 | |
| Balance at end of period | 6 | 23 | |
| Botlek closure | |||
| Restructuring Reserve [Roll Forward] | |||
| Balance at beginning of period | 16 | 16 | 0 |
| Changes in Reserves | 9 | 78 | |
| Cash Payments | (19) | (57) | |
| Foreign currency translation and other | 0 | 2 | |
| Balance at end of period | 6 | $ 23 | |
| Fuzhou closure | |||
| Restructuring Reserve [Roll Forward] | |||
| Balance at beginning of period | 12 | 12 | |
| Changes in Reserves | 4 | 4 | |
| Cash Payments | $ (16) | (16) | |
| Foreign currency translation and other | 0 | ||
| Balance at end of period | $ 0 | ||