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Supplemental Cash Flow Information (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Sep. 11, 2020
Aug. 14, 2020
Dec. 05, 2018
Jan. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in other operating assets and liabilities              
Decrease in accounts receivable         $ 67 $ 87 $ 180
(Increase) decrease in other assets         (113) (30) 3
Decrease in accounts payable and other current liabilities         (254) (21) (154)
Increase (decrease) in other long-term liabilities         2 (34) 80
Change in income taxes receivable / payable, net         (69) (303) 125
Change in receivables from / payables to affiliates, net         14 (10)  
Net change in operating assets and liabilities         (353) (311) 234
Certain cash operating activities              
Cash payments for interest         593 648 570
Cash payments for income taxes         70 121 151
Non-cash investing and financing activities              
Capital additions, accrued at end of period         15 48 30
Issuance of debt in exchange transactions         925    
Equity component of exchangeable debt         $ 46   172
Issuance of shares in business combinations             2,112
Issuance of debt in business combination             $ 1,026
2.50% Senior Guaranteed Exchangeable Bonds due January 2027              
Non-cash investing and financing activities              
Issuance of debt in exchange transactions   $ 238          
Equity component of exchangeable debt   $ 46          
Debt instrument interest rate stated percentage         2.50%    
11.50% Senior Guaranteed Notes due January 2027              
Non-cash investing and financing activities              
Issuance of debt in exchange transactions $ 687            
Debt instrument interest rate stated percentage 11.50%       11.50%    
Songa              
Non-cash investing and financing activities              
Issuance of shares in business combinations       $ 735   $ 735  
Newly issued shares (in shares)       66.9   66.9  
Convertible debt           $ 854  
Ocean Rig              
Non-cash investing and financing activities              
Issuance of shares in business combinations     $ 1,380     $ 1,400  
Newly issued shares (in shares)     147.7     147.7