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Business Combinations - Narrative (Details)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended 10 Months Ended
Apr. 03, 2023
USD ($)
rig
$ / shares
shares
Jun. 30, 2023
USD ($)
rig
Dec. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
rig
Dec. 31, 2022
USD ($)
May 19, 2023
contract
Business Combination Segment Allocation [Line Items]            
Number of offshore drilling units owned | rig   22   22    
Number of tender-assist drilling units sold | contract           3
Share issuance costs   $ 4        
Initial accounting incomplete, adjustment for financial liabilities       $ 49    
Initial accounting incomplete, adjustment for current financial assets       6    
Initial accounting incomplete, adjustment for non-current financial assets       1    
Additional paid-in capital            
Business Combination Segment Allocation [Line Items]            
Share issuance costs   4        
Aquadrill LLC            
Business Combination Segment Allocation [Line Items]            
Stock issued during period, shares, acquisitions (in shares) | shares 29,900          
Consideration settled by tax withholding $ 30          
Consideration settled in cash $ 1          
Acquisition cost expensed     $ 2 8 $ 3  
Seadrill share price at April 3, 2023 market close (in USD per share) | $ / shares $ 41.62          
Aquadrill LLC | Additional paid-in capital            
Business Combination Segment Allocation [Line Items]            
Share issuance costs   $ 4        
Seadrill Limited            
Business Combination Segment Allocation [Line Items]            
Acquisition cost expensed     $ 3 $ 11    
Aquadrill LLC | Seadrill Limited            
Business Combination Segment Allocation [Line Items]            
Noncontrolling interest, ownership percentage by noncontrolling owners 37.00%          
Drillships | Aquadrill LLC            
Business Combination Segment Allocation [Line Items]            
Number of offshore drilling units owned | rig 4          
Benign environment semi-submersible | Aquadrill LLC            
Business Combination Segment Allocation [Line Items]            
Number of offshore drilling units owned | rig 1          
Tender-assist units | Aquadrill LLC            
Business Combination Segment Allocation [Line Items]            
Number of offshore drilling units owned | rig 3