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Unconsolidated Affiliates (Details)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2023
USD ($)
Nov. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Investments            
Equity in losses       $ (24) $ (10) $ (10)
Aggregate carrying amount of equity investment       113 91  
Loss on impairment of investment in unconsolidated affiliates         37 62
Investments in loans to unconsolidated affiliates       $ 5 33 2
Orion/Transocean Norge            
Investments            
Equity ownership (as a percent)       33.00%    
Aggregate carrying amount of equity investment       $ 54 57  
Loss on impairment of investment in unconsolidated affiliates         37 $ 59
Investments in loans to unconsolidated affiliates     $ 33      
Affiliate loan receivable       41 $ 36  
Orion/Transocean Norge | LIBOR            
Investments            
Loan receivable interest rate (as a percent)     6.50%      
Orion/Transocean Norge | Orion/Transocean Norge            
Investments            
Loan payable     $ 100      
Orion/Transocean Norge | Discount rate            
Investments            
Investment fair value measurement         0.12 0.12
Orion/Transocean Norge | Reimbursements, Agent Fees and Other Receipts            
Investments            
Related party transaction       40 $ 16 $ 46
Orion/Transocean Norge | Rent Expense            
Investments            
Related party transaction       11 12 22
Orion/Transocean Norge | Charter rig and other equipment            
Investments            
Related party transaction       $ 10 15 22
Liquila            
Investments            
Equity ownership (as a percent)       20.00%    
Aggregate carrying amount of equity investment       $ 15    
Majority owner require repurchase (as a percent)   80.00%        
Equity method investment payment   $ 15        
Liquila | Perestroika AS            
Investments            
Equity method investment payment   $ 10        
Liquila | Third Party            
Investments            
Equity ownership (as a percent)   67.00%        
Liquila | Transocean Inc | Perestroika AS            
Investments            
Equity ownership (as a percent)   11.00%        
Liquila | Liquila            
Investments            
Purchase price for investment   $ 200        
Nauticus Robotics            
Investments            
Equity ownership (as a percent)       20.00%    
Global Sea Mineral Resources            
Investments            
Equity method investment payment $ 10          
Other Investments            
Investments            
Related party transaction       $ 7 $ 6 $ 15