Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.23.1
Debt (Details) - USD ($)
3 Months Ended
Feb. 28, 2023
Mar. 31, 2023
Dec. 31, 2022
Nov. 08, 2022
Oct. 03, 2022
3.125% Exchangeable Senior Debentures due 2053          
Debt disclosures          
Carrying value   $ 1,251,000,000      
Principal amount $ 1,265,000,000        
Interest rate (as a percent) 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          
Carrying value     $ 560,000,000    
Interest rate (as a percent)   2.75% 2.75%    
1.25% Exchangeable Senior Debentures due 2050          
Debt disclosures          
Carrying value   $ 2,000,000 $ 798,000,000    
Interest rate (as a percent)   1.25% 1.25%    
1.75% Exchangeable Senior Debentures due 2046          
Debt disclosures          
Carrying value     $ 15,000,000    
Interest rate (as a percent)   1.75% 1.75%    
Line of credit          
Debt disclosures          
Carrying value   $ 396,000,000 $ 397,000,000    
SPV | Margin Loan Facility          
Debt disclosures          
Carrying value   $ 1,400,000,000 $ 1,400,000,000    
Number of business days prior to the maturity date   5 days      
Remaining borrowing capacity   $ 900,000,000      
SPV | Margin Loan Facility | Charter. | Asset Pledged as Collateral          
Debt disclosures          
Shares owned   37,300,000      
Additional shares pledged as collateral         6,000,000
Value of pledged collateral   $ 13,300,000,000      
SPV | Margin Loan Facility | Three-month LIBOR          
Debt disclosures          
Interest rate basis   three-month LIBOR      
Basis spread on variable rate   1.50%      
SPV | 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