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Fair value of financial instruments (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of fair value of financial instruments measured at amortized cost | The carrying values and estimated fair values of certain of our financial instruments as of the dates specified were as follows:
| September 30, 2025 |  | December 31, 2024
(In $ millions) | Fair value |  | Carrying value |  | Fair value |  | Carrying value
Liabilities |  |  |  |  |  |  |
$575 million secured bond (Level 1) | 597 |  |  | 562 |  |  | 587 |  |  | 560 |
Unsecured senior convertible bond - debt component (Level 3) | 56 |  |  | 50 |  |  | 56 |  |  | 50 |

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