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Chapter 11 Proceedings - Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Reorganization, Chapter 11 [Line Items]        
Cash and cash equivalents $ 428 $ 526    
Restricted cash 147 132    
Accounts receivable, net 122 125    
Amounts due from related parties, net 50 85    
Other current assets 200 194    
Total current assets 947 1,062    
Investments in associated companies 248 248    
Drilling units 1,927 2,120    
Restricted cash 69 65    
Deferred tax assets 8 9    
Equipment 16 19    
Amounts due from related parties, net 410 392    
Other non-current assets 32 46    
Total non-current assets 2,710 2,899    
Total assets 3,657 3,961    
Trade accounts payable (57) (45)    
Short-term debt due to related party 0 (7)    
Other current liabilities (275) (316)    
Total current liabilities (878) (6,545)    
Liabilities subject to compromise (6,406)   $ 0  
Deferred tax liabilities (8) (10)    
Other non-current liabilities (105) (120)    
Total non-current liabilities (113) (556)    
Total equity 3,740 3,140 $ 98 $ (1,793)
Total liabilities and equity (3,657) $ (3,961)    
Reorganization, Chapter 11, Debtor-in-Possession        
Reorganization, Chapter 11 [Line Items]        
Cash and cash equivalents 414      
Restricted cash 78      
Accounts receivable, net 122      
Amounts due from related parties, net 81      
Other current assets 185      
Total current assets 880      
Investments in associated companies 25      
Drilling units 1,927      
Shares in subsidiaries 409      
Restricted cash 69      
Deferred tax assets 8      
Equipment 16      
Amounts due from related parties, net 3      
Other non-current assets 32      
Total non-current assets 2,489      
Total assets 3,369      
Trade accounts payable (56)      
Short-term debt due to related party (1)      
Other current liabilities (239)      
Total current liabilities (296)      
Liabilities subject to compromise (6,416)      
Deferred tax liabilities (8)      
Other non-current liabilities (105)      
Total non-current liabilities (113)      
Total equity 3,456      
Total liabilities and equity $ (3,369)