v3.26.1
Cover - shares
3 Months Ended
Mar. 31, 2026
May 06, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-39327  
Registrant Name SEADRILL LIMITED  
Entity Incorporation, State or Country Code D0  
Entity Tax Identification Number 98-1834031  
Entity Address, Address Line One 4425 Westway Park Blvd.  
Entity Address, Address Line Two Suite 170,  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Country US  
Entity Address, Postal Zip Code 77041  
City Area Code (713)  
Local Phone Number 329-1150  
Title of 12(b) Security Common Shares, par value $0.01 per share  
Trading Symbol SDRL  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Bankruptcy Proceedings, Reporting Current true  
Entity Common Stock, Shares Outstanding   62,530,508
Central Index Key 0001737706  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31  
Amendment Flag false