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Commitment and contingencies - Narrative (Details) kr in Millions, R$ in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2025 USD ($) | Mar. 05, 2023 USD ($) | Oct. 31, 2025 USD ($) | Jan. 31, 2025 USD ($) rig drillship | Mar. 31, 2023 USD ($) | Mar. 31, 2026 USD ($) contract rig | Mar. 31, 2026 BRL (R$) | Aug. 31, 2025 NOK (kr) | Jul. 11, 2025 USD ($) | Nov. 30, 2015 USD ($) rig
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Contract value deduction percentage |  |  |  |  |  |  |  |  |  | 2.00%
Contract value deduction |  |  |  |  |  |  |  |  |  | $ 69
Number of active contracts | contract |  |  |  |  |  | 2 |  |  |  |
Number of future contracts | contract |  |  |  |  |  | 2 |  |  |  |
Sonadrill | Guarantees in favor of customers |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure, undiscounted |  |  |  |  |  | $ 1,100 |  |  |  |
Number of rigs | rig |  |  |  |  |  | 3 |  |  |  |
Surety Bond |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  | $ 83 | R$ 435 |  |  |
Seadrill Serviços de Petróleo Ltda ("Seadrill Brazil") | Tax Year 2009 |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Damages sought | $ 83 |  |  |  |  |  |  |  |  |
Seadrill Serviços de Petróleo Ltda ("Seadrill Brazil") | Tax Year 2008, 2012, 2016, and 2017 |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  | 89 |  |  |  |
Sete Brazil Claim |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  | $ 213 |  | 825 |  |  |  |
Number of rigs | rig |  |  |  | 28 |  |  |  |  |  |
Number of drillships | drillship |  |  |  | 3 |  |  |  |  |  |
Delay penalties |  |  |  | 10.00% |  |  |  |  |  |
Nigeria |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of rigs | rig |  |  |  |  |  |  |  |  |  | 3
Brazil | Sete Brazil Claim | Seadrill Serviços de Petróleo Ltda ("Seadrill Brazil") |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of drillships | drillship |  |  |  | 5 |  |  |  |  |  |
SFL Hercules Ltd |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Amount awarded |  | $ 37 |  |  |  |  |  |  |  |
Fee expense |  | $ 11 |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure, undiscounted |  |  |  |  |  | 59 |  | kr 574 |  |
SFL Hercules Ltd | Five Year First Lien Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure, undiscounted |  |  |  |  |  | 41 |  | 403 |  |
SFL Hercules Ltd | Bilateral Facility |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure, undiscounted |  |  |  |  |  | $ 18 |  | kr 171 |  |
Sonadrill fees claimant |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  | $ 72 |  |  |  |  |
Damages paid |  |  | $ 43 |  |  |  |  |  |  |
Sonadrill fees claimant | Maximum |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  | $ 61 |

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