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Investment in associated companies - Ownership Percentage (Details)
$ in Millions
12 Months Ended
Feb. 24, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
rig
Sep. 30, 2022
Feb. 22, 2022
Jan. 31, 2022
Jan. 20, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]                
Number of drillships     2          
PES                
Schedule of Equity Method Investments [Line Items]                
Ownership interest prior to disposal (in percent)           65.00%    
Sonadrill                
Schedule of Equity Method Investments [Line Items]                
Number of drillships leased     3          
Gulf Drilling International | Gulfdrill                
Schedule of Equity Method Investments [Line Items]                
Ownership interest (as percent)     50.00%          
Sonadrill                
Schedule of Equity Method Investments [Line Items]                
Ownership interest ( in percent)   50.00% 50.00%   50.00%     50.00%
Number of drillships     3          
Number of drillships managed     3          
Sonadrill | Joint venture partner                
Schedule of Equity Method Investments [Line Items]                
Ownership interest ( in percent)   50.00% 50.00%          
Sonadrill | Sonangol                
Schedule of Equity Method Investments [Line Items]                
Ownership interest ( in percent)     50.00%          
Number of drillships     2          
Gulfdrill                
Schedule of Equity Method Investments [Line Items]                
Ownership interest ( in percent)   50.00% 50.00%   50.00%     50.00%
Number of premium jack-ups     5          
Gulfdrill | Seadrill Limited                
Schedule of Equity Method Investments [Line Items]                
Number of leased rigs     3          
Gulfdrill | Third party                
Schedule of Equity Method Investments [Line Items]                
Number of leased rigs     2          
Gulfdrill | Joint venture partner                
Schedule of Equity Method Investments [Line Items]                
Ownership interest ( in percent)   50.00% 50.00%          
PES                
Schedule of Equity Method Investments [Line Items]                
Ownership interest ( in percent) 35.00% 35.00% 0.00% 35.00%   35.00% 35.00%  
Realized gain (loss) on disposal | $   $ (112)            
Proceeds from sale of equity method investments | $ $ 44              
Archer | PES                
Schedule of Equity Method Investments [Line Items]                
Ownership interest ( in percent)           15.70%