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Drilling Fleet (Disposal) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dispositions          
Net cash proceeds from sale of assets     $ 16 $ 36  
Gain (loss) on the sale of assets $ 1 $ (15)   (20)  
Assets sold, not discontinued operations | Rig sales          
Dispositions          
Net cash proceeds from sale of assets   1 11 25  
Gain (loss) on the sale of assets 3 1 8 7  
Assets sold, not discontinued operations | Sale of other assets          
Dispositions          
Net cash proceeds from sale of assets 1 2 5 8  
Gain (loss) on the sale of assets (2) $ (16) (8) $ (27)  
Assets held for sale          
Dispositions          
Aggregate carrying amount of assets held for sale $ 6   $ 6   $ 8