v3.26.1
Long-Lived Assets (Disposals) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Disposals            
Gain (loss) on the sale of assets   $ (2) $ 7 $ 2 $ 9  
Proceeds from disposal of assets, net of costs to sell       26 10  
Assets sold, not discontinued operations | Rig sales            
Disposals            
Gain (loss) on the sale of assets       4    
Proceeds from disposal of assets, net of costs to sell       27   $ 3
Assets sold, not discontinued operations | Rig sales | Subsequent Event            
Disposals            
Proceeds from disposal of assets, net of costs to sell $ 3          
Assets sold, not discontinued operations | Other property and equipment            
Disposals            
Gain (loss) on the sale of assets       (2) 9  
Proceeds from disposal of assets, net of costs to sell       $ 2 $ 10