v3.26.1
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