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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Operating revenues        
Contract drilling revenues $ 1,028 $ 948 $ 2,922 $ 2,572
Revenue from Contract with Customer, Product and Service [Extensible Enumeration] us-gaap:OilAndGasServiceMember us-gaap:OilAndGasServiceMember us-gaap:OilAndGasServiceMember us-gaap:OilAndGasServiceMember
Costs and expenses        
Operating and maintenance $ 584 $ 563 $ 1,801 $ 1,620
Cost, Product and Service [Extensible Enumeration] us-gaap:OilAndGasServiceMember us-gaap:OilAndGasServiceMember us-gaap:OilAndGasServiceMember us-gaap:OilAndGasServiceMember
Depreciation and amortization $ 161 $ 190 $ 512 $ 559
General and administrative 46 47 145 158
Total costs and expenses 791 800 2,458 2,337
Loss on impairment of assets (1,913) (629) (3,049) (772)
Gain (loss) on disposal of assets, net (1) (4) 8 (10)
Operating loss (1,677) (485) (2,577) (547)
Other income (expense), net        
Interest income 12 11 30 40
Interest expense, net of amounts capitalized (154) (80) (382) (271)
Gain on retirement of debt   21   161
Other, net (78) 8 (101) 32
Total other income (expense), net (220) (40) (453) (38)
Loss before income tax expense (benefit) (1,897) (525) (3,030) (585)
Income tax expense (benefit) 26 (31) (90) (66)
Net loss (1,923) (494) (2,940) (519)
Net loss attributable to controlling interest $ (1,923) $ (494) $ (2,940) $ (519)
Loss per share, basic (in dollars per share) $ (2) $ (0.56) $ (3.23) $ (0.62)
Loss per share, diluted (in dollars per share) $ (2) $ (0.58) $ (3.23) $ (0.65)
Weighted-average shares outstanding, basic (in shares) 961 879 911 840
Weighted-average shares outstanding, diluted (in shares) 961 954 911 915