v3.26.3
Long-Lived Assets (Disposals) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Disposals          
Gain (loss) on the sale of assets $ 3 $ (1) $ 5 $ 8  
Proceeds from disposal of assets, net of costs to sell     31 44  
Assets sold, not discontinued operations | Rig sales          
Disposals          
Gain (loss) on the sale of assets     6    
Proceeds from disposal of assets, net of costs to sell     30 34  
Cash deposits received for the sale of assets         $ 3
Gain (loss) on disposal of assets, tax effect     0    
Assets sold, not discontinued operations | Other property and equipment          
Disposals          
Gain (loss) on the sale of assets     (1) 8  
Proceeds from disposal of assets, net of costs to sell     $ 4 $ 10