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Debt (Credit Agreements) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Jul. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 30, 2022
USD ($)
Jun. 30, 2018
USD ($)
Debt                
Aggregate cash payment to acquire property       $ 717 $ 208 $ 265    
Five-Year Revolving Credit Facility                
Debt                
Borrowing capacity, maximum     $ 1,330          
Early maturity trigger, principal due within 91 days   $ 200            
Early maturity trigger available cash   250            
Permitted commitment increase   250            
Minimum guarantee coverage ratio 3.0     3.0        
Minimum collateral coverage ratio. 2.1     2.1        
Debt to capitalization ratio               0.60
Minimum liquidity               $ 500
Aggregate carrying amount assets pledged $ 4,870     $ 4,870        
Cross default trigger under credit facility   125            
Commitment fee percentage at period end       0.75%        
Credit facility amount outstanding 0     $ 0        
Letters of credit issued and outstanding 6     6        
Credit facility available borrowing capacity 767,000     $ 767,000        
Five-Year Revolving Credit Facility | June 2022                
Debt                
Borrowing capacity, maximum   774            
Five-Year Revolving Credit Facility | June 2023                
Debt                
Borrowing capacity, maximum   $ 600            
Five-Year Revolving Credit Facility | Adjusted LIBOR                
Debt                
Spread on variable rate basis (as a percent)       3.25%        
Five-Year Revolving Credit Facility | Term SOFR                
Debt                
Spread on variable rate basis (as a percent)   0.10%            
4.50% Shipyard Loan due June 2027                
Debt                
Aggregate principal amount outstanding 439     $ 439        
Debt instrument face value 439   349 439     $ 90  
Aggregate cash payment to acquire property 325   46          
Non-cash capital addition $ 82   $ 300 $ 382        
Debt instrument interest rate stated percentage 4.50%     4.50%        
4.50% Shipyard Loan due June 2027 | Discount rate                
Debt                
Debt fair value measurement input 7.6   9.4 7.6