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Debt (Issuance) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 15, 2025 | Apr. 30, 2024 | Sep. 30, 2024 | Oct. 31, 2025 | Sep. 30, 2025 | Jun. 30, 2024
Debt |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 1,770 | $ 1,767 |  |  |
Orion/Transocean Norge | Orion/Transocean Norge |  |  |  |  |  |
Debt |  |  |  |  |  |
Equity ownership (as a percent) |  |  |  |  |  | 67.00%
8.00% Senior Notes due February 2027 |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 8.00% |  | 8.00% | 8.00%
8.00% Senior Notes due February 2027 | Subsequent Event |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 8.00% |  |
8.00% Senior Notes due February 2027 | Orion/Transocean Norge |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 8.00%
8.00% Senior Notes due February 2027 | Orion/Transocean Norge |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt instrument face value |  |  |  |  |  | $ 130
Debt instrument interest rate stated percentage |  |  |  |  |  | 8.00%
8.25% Senior Notes due May 2029 |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt instrument face value |  | $ 900 |  |  |  |
Debt instrument interest rate stated percentage |  | 8.25% |  |  | 8.25% |
8.50% Senior Notes due May 2031 |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt instrument face value |  | $ 900 |  |  |  |
Debt instrument interest rate stated percentage |  | 8.50% |  |  | 8.50% |
7.875% Senior Guaranteed Notes due October 2032. | Subsequent Event |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt instrument face value | $ 500 |  |  |  |  |
Debt instrument interest rate stated percentage | 7.875% |  |  |  |  |
Proceeds from issuance of debt | $ 492 |  |  |  |  |
7.875% Senior Guaranteed Notes due October 2032. | Subsequent Event | Redemption of up to 40% of principal amount of debt |  |  |  |  |  |
Debt |  |  |  |  |  |
Redemption price of debt instrument (as a percent) | 107.875% |  |  |  |  |
7.875% Senior Guaranteed Notes due October 2032. | Subsequent Event | Redemption of all or a portion of principal amount of debt |  |  |  |  |  |
Debt |  |  |  |  |  |
Redemption price of debt instrument (as a percent) | 100.00% |  |  |  |  |
7.875% Senior Guaranteed Notes due October 2032. | Subsequent Event | Maximum | Redemption of up to 40% of principal amount of debt |  |  |  |  |  |
Debt |  |  |  |  |  |
Principal amount of debt redeemed (as a percent) | 40.00% |  |  |  |  |

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