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Subsequent Events (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 26, 2021
USD ($)
$ / shares
Sep. 11, 2020
USD ($)
Aug. 14, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
$ / shares
Subsequent events            
Issuance of debt in exchange transactions       $ 925    
Aggregate cash payment       $ 1,109 $ 971  
0.50% Exchangeable Senior Bonds due January 2023            
Subsequent events            
Original debt in exchange     $ 397      
Debt instrument interest rate stated percentage       0.50%    
Debt conversion ratio           0.09729756
Debt conversion (in dollars per share) | $ / shares           $ 10.28
11.50% Senior Guaranteed Notes due January 2027            
Subsequent events            
Issuance of debt in exchange transactions   $ 687        
Debt instrument interest rate stated percentage   11.50%   11.50%    
Subsequent Event | 0.50% Exchangeable Senior Bonds due January 2023            
Subsequent events            
Original debt in exchange $ 323          
Aggregate cash payment 11          
Subsequent Event | 4.00% Senior Guaranteed Exchangeable Bonds due 2025            
Subsequent events            
Issuance of debt in exchange transactions $ 294          
Debt instrument interest rate stated percentage 4.00%          
Debt conversion ratio 0.1904762          
Debt conversion (in dollars per share) | $ / shares $ 5.25          
Subsequent Event | 11.50% Senior Guaranteed Notes due January 2027            
Subsequent events            
Debt instrument interest rate stated percentage 11.50%