Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

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Debt (Details) - USD ($)
 6 Months Ended
Jul. 02, 2024
Jun. 26, 2024
Feb. 28, 2023
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Margin Loan Facility | Subsequent event                
Debt disclosures                
Repayment of debt $ 540,000,000              
Remaining borrowing capacity 1,150,000,000              
3.125% Exchangeable Senior Debentures due 2054 | Subsequent event                
Debt disclosures                
Principal amount $ 860,000,000              
Interest rate (as a percent) 3.125%              
Shares attributable to debentures per $1,000 original principal amount of Debentures 2.5442              
Total shares attributable to debentures 2,188,012              
Debt instrument, face amount per debenture $ 1,000              
Exchange price of shares attributable to debentures $ 393.05              
Percentage of redemption and purchase price 100.00%              
3.125% Exchangeable Senior Debentures due 2053                
Debt disclosures                
Carrying value       $ 1,211,000,000 $ 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%          
3.125% Exchangeable Senior Debentures due 2053 | Subsequent event                
Debt disclosures                
Debt instrument, repurchased face amount $ 300,000,000              
Interest rate (as a percent) 3.125%              
Exchangeable Senior Debentures Option                
Debt disclosures                
Principal amount     $ 165,000,000          
Exchangeable Senior Debentures Option | Subsequent event                
Debt disclosures                
Principal amount $ 60,000,000              
2.75% Exchangeable Senior Debentures due 2050                
Debt disclosures                
Interest rate (as a percent)             2.75% 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% 1.75%
Line of credit                
Debt disclosures                
Carrying value       $ 443,000,000 $ 394,000,000      
SPV | Margin Loan Facility                
Debt disclosures                
Carrying value       $ 1,330,000,000 $ 1,460,000,000      
Number of business days prior to the maturity date       5 days        
Remaining borrowing capacity       $ 970,000,000        
SPV | Margin Loan Facility | Charter. | Asset Pledged as Collateral                
Debt disclosures                
Shares owned       19,100,000        
Value of pledged collateral       $ 5,700,000,000        
SPV | Margin Loan Facility | SOFR                
Debt disclosures                
Interest rate basis   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