Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

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Debt (Details) - USD ($)
 3 Months Ended
May 17, 2023
Feb. 28, 2023
Aug. 12, 2020
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Mar. 31, 2023
3.125% Exchangeable Senior Debentures due 2053              
Debt disclosures              
Carrying value       $ 1,200,000,000 $ 1,255,000,000    
Principal amount   $ 1,265,000,000          
Interest rate (as a percent)   3.125%   3.125% 3.125%    
Shares attributable to debentures per $1,000 original principal amount of Debentures   1.8901          
Total shares attributable to debentures   2,390,977          
Debt instrument, face amount per debenture   $ 1,000          
Exchange price of shares attributable to debentures   $ 529.07          
Percentage of redemption and purchase price   100.00%          
Exchangeable Senior Debentures Option              
Debt disclosures              
Principal amount   $ 165,000,000          
2.75% Exchangeable Senior Debentures due 2050              
Debt disclosures              
Interest rate (as a percent)             2.75%
1.25% Exchangeable Senior Debentures due 2050              
Debt disclosures              
Interest rate (as a percent)           1.25%  
1.75% Exchangeable Senior Debentures due 2046              
Debt disclosures              
Interest rate (as a percent)             1.75%
Line of credit              
Debt disclosures              
Carrying value       $ 334,000,000 $ 394,000,000    
SPV | Margin Loan Facility              
Debt disclosures              
Carrying value       $ 1,480,000,000 $ 1,460,000,000    
Number of business days prior to the maturity date       5 days      
Remaining borrowing capacity       $ 820,000,000      
SPV | Margin Loan Facility | Charter. | Asset Pledged as Collateral              
Debt disclosures              
Shares owned       19,100,000      
Value of pledged collateral       $ 5,500,000,000      
SPV | Margin Loan Facility | Three-month LIBOR              
Debt disclosures              
Interest rate basis     three-month LIBOR        
Basis spread on variable rate     1.50%        
SPV | Margin Loan Facility | SOFR              
Debt disclosures              
Interest rate basis three-month SOFR            
Basis spread on variable rate 1.875%            
Commitment Fee Percentage 0.50%            
SPV | Term loan              
Debt disclosures              
Carrying value $ 1,150,000,000            
SPV | Revolving Credit Facility              
Debt disclosures              
Maximum borrowing capacity 1,150,000,000            
SPV | Uncommitted Incremental Term Loan Facility              
Debt disclosures              
Maximum borrowing capacity $ 200,000,000