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Related party transactions
 9 Months Ended
Sep. 30, 2025
Related Party Transactions [Abstract]  
Related party transactions Related party transactions
As of September 30, 2025, our major related party is the Sonadrill joint venture, over which we hold significant influence.
Related party revenues
Our related party revenues include the following:
Three months ended September 30,Nine months ended September 30,
 (In $ millions)
2025202420252024
Management fees revenues (a)
61 59 181 176 
Add-on services2 3 8 9 
Reimbursable revenues (b)
5 3 21 10 
Leasing revenues (c)
9 9 25 46 
Other— — — 5 
Total related party operating revenues77 74 235 246 
(a) Seadrill provides management and administrative services and operational and technical support services to Sonadrill. These services are charged on a dayrate basis.
(b) Reimbursable revenues primarily relate to Sonadrill project work on the Libongos, Quenguela and West Gemini rigs.
(c) During 2025, we earned leasing revenues on the charter of the West Gemini to Sonadrill. During 2024, we also earned leasing revenues from the West Castor, West Telesto, and West Tucana, which were leased to Gulfdrill, up to their disposal in June 2024.
Related party balances
Sonadrill prepaid management fees as of September 30, 2025 and December 31, 2024 of $5 million and $7 million, respectively, to Seadrill. These balances were recorded in "Other current liabilities" within our unaudited Condensed Consolidated Balance Sheets.