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v3.25.3

Equity (Share Issuance) (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2025
Equity |  |  |  |
Issuance of shares (in shares) | 143.8 |  |  |
Proceeds from issuance of shares, net of issue costs | $ 421 |  |  | $ 421
Perestroika AS | Related party |  |  |  |
Equity |  |  |  |
Issuance of shares (in shares) | 4.0 |  |  |
Proceeds from issuance of shares, net of issue costs | $ 12 |  |  |
Perestroika AS | Transocean Inc | Director Affiliated with Perestroika Ltd. | Related party |  |  |  |
Equity |  |  |  |
Ownership interest (as a percent) | 10.00% |  | 10.00% | 10.00%
4.00% Senior Guaranteed Exchangeable Bonds due December 2025 |  |  |  |
Equity |  |  |  |
Shares issued upon conversion (in shares) |  |  | 54.7 | 73.3
Debt issued in exchange transactions |  |  | $ 147 | $ 196
Debt instrument interest rate stated percentage | 4.00% |  | 4.00% | 4.00%
Orion/Transocean Norge |  |  |  |
Equity |  |  |  |
Newly issued shares in asset acquisition (in shares) |  | 55.5 |  |
Value shares issued in asset acquisition |  | $ 297 |  |
Orion/Transocean Norge | Orion/Transocean Norge |  |  |  |
Equity |  |  |  |
Equity ownership (as a percent) |  | 67.00% |  |

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