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Drilling Fleet (Disposal) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
item
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dispositions      
Number of mobile offshore drilling units | item 41    
Net cash proceeds from sale of assets $ 1 $ 12  
Gain (loss) on the sale of assets (1) $ 7  
Assets held for sale, included in other current assets 5   $ 0
Assets sold, not discontinued operations | Rig sales      
Dispositions      
Net cash proceeds from sale of assets 11    
Gain (loss) on the sale of assets 1    
Gain (loss) on disposal of assets, tax effect 0    
Assets sold, not discontinued operations | Other property and equipment      
Dispositions      
Net cash proceeds from sale of assets 1    
Gain (loss) on the sale of assets $ (6)