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Restructuring and Other Charges - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 17, 2026 USD ($) | Jan. 31, 2026 USD ($) employee T | Mar. 31, 2025 USD ($) employee T | Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring and other charges |  |  |  | $ 4 | $ 42 | $ 18 | $ 128 |  |
Non-cash charges |  |  |  | 0 | 9 | 3 | 63 |  |
Cash charges |  |  |  | 4 | 33 | 15 | 65 |  |
Cash Payments |  |  |  |  |  | 29 | 27 |  |
Changes in Reserves |  |  |  |  |  | 12 | 53 |  |
Restructuring reserve |  |  |  | 11 | 28 | 11 | 28 | $ 28 | $ 0
Proceeds from dispositions and asset sales |  |  |  |  |  | 15 | 2 |  |
Botlek closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Plant capacity | T |  |  | 90,000 |  |  |  |  |  |
Number of employees impacted | employee |  |  | 240 |  |  |  |  |  |
Restructuring and related charges, expected cost |  |  | $ 184 |  |  |  |  |  |
Restructuring and other charges |  |  |  | 2 | 42 | 11 | 128 |  |
Non-cash charges |  |  |  | 0 | 9 | 3 | 63 |  |
Cash charges |  |  |  | 2 | 33 | 8 | 65 |  |
Cash Payments |  |  |  |  |  | 13 | 27 |  |
Changes in Reserves |  |  |  |  |  | 8 | 53 |  |
Restructuring reserve |  |  |  | 11 | 28 | 11 | 28 | 16 | $ 0
Fuzhou closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Plant capacity | T |  | 46,000 |  |  |  |  |  |  |
Number of employees impacted | employee |  | 550 |  |  |  |  |  |  |
Restructuring and related charges, expected cost |  | $ 66 |  |  |  |  |  |  |
Restructuring and other charges |  |  |  | 2 |  | 7 |  |  |
Non-cash charges |  |  |  | 0 |  | 0 |  |  |
Cash charges |  |  |  | 2 |  | 7 |  |  |
Cash Payments |  |  |  | 16 |  | 16 |  |  |
Changes in Reserves |  |  |  | 4 |  | 4 |  |  |
Restructuring reserve |  |  |  | 0 |  | 0 |  | 12 |
Fuzhou closure | Subsequent Event |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from dispositions and asset sales | $ 14 |  |  |  |  |  |  |  |
Derecognition of net liability on disposal | 6 |  |  |  |  |  |  |  |
Gain on disposal | $ 20 |  |  |  |  |  |  |  |
Balance Sheet Location [Axis]: us-gaap:AccruedLiabilitiesCurrent |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  |  | 7 |  | 7 |  | 23 |
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  |  | 4 |  | 4 |  | $ 5 |
Idling Activities |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 2 | 24 | 8 | 30 |  |
Idling Activities | Botlek closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring and related charges, expected cost |  |  | $ 74 |  |  |  |  |  |
Cash charges |  |  |  | 1 | 24 | 5 | 30 |  |
Idling Activities | Fuzhou closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring and related charges, expected cost |  | $ 38 |  |  |  |  |  |  |
Cash charges |  |  |  | 1 |  | 3 |  |  |
Severance and employee benefits |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 2 | 9 | 6 | 17 |  |
Severance and employee benefits | Botlek closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 1 | 9 | 2 | 17 |  |
Severance and employee benefits | Fuzhou closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 1 |  | 4 |  |  |
Asset retirement obligation adjustments |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 0 | 0 | 0 | 11 |  |
Asset retirement obligation adjustments | Botlek closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 0 | 0 | 0 | 11 |  |
Asset retirement obligation adjustments | Fuzhou closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 0 |  | 0 |  |  |
Contract abandonment and other changes |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 0 | 0 | 1 | 7 |  |
Contract abandonment and other changes | Botlek closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 0 | 0 | 1 | 7 |  |
Contract abandonment and other changes | Fuzhou closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 0 |  | 0 |  |  |
Environmental liability |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 0 | 0 | 0 | 0 |  |
Environmental liability | Botlek closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | 0 | $ 0 | 0 | $ 0 |  |
Environmental liability | Fuzhou closure |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash charges |  |  |  | $ 0 |  | $ 0 |  |  |

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