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Segment Information - Segment Results (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]        
Drilling units and new buildings $ 12,780   $ 13,464  
Operating Revenue 712 $ 1,146    
Depreciation and amortization 391 406    
Operating loss (613) (17)    
Drilling unit and new buildings capital expenditure 117 66    
Unallocated items:        
Assets held for sale     126  
Total financial items and other 14 (96)    
Investments in associated companies 1,615   1,473  
Income taxes (36) 12    
Marketable securities 121   124  
Net loss (635) (101)    
Cash and restricted cash 1,218 1,441 1,359 $ 1,443
Other assets 1,311   1,436  
Total assets 17,045   17,982  
Floaters [Member]        
Segment Reporting Information [Line Items]        
Drilling units and new buildings 9,411   9,956  
Operating Revenue 482 744    
Depreciation and amortization 298 301    
Operating loss (446) 95    
Drilling unit and new buildings capital expenditure 93 54    
Jack Ups [Member]        
Segment Reporting Information [Line Items]        
Drilling units and new buildings 3,369   $ 3,508  
Operating Revenue 193 360    
Depreciation and amortization 93 105    
Operating loss (167) (115)    
Drilling unit and new buildings capital expenditure 24 12    
Other Drilling Units [Member]        
Segment Reporting Information [Line Items]        
Operating Revenue $ 37 42    
Operating loss   $ 3