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Long-Term Debt (Narrative) (Details)
 1 Months Ended 12 Months Ended
Nov. 30, 2021
USD ($)
Dec. 31, 2023
USD ($)
type_of_borrowing
business_day
lender
Dec. 31, 2022
USD ($)
Short-term Debt [Line Items]      
Total authorized program   $ 1,200,000,000 $ 1,200,000,000
Number of lenders in syndicate | lender   12  
Number of types of borrowing that may be elected under the facility | type_of_borrowing   5  
Number of business days' notice to terminate facility | business_day   3  
Letter of Credit      
Short-term Debt [Line Items]      
Total authorized program   $ 125,000,000.0  
Line of Credit      
Short-term Debt [Line Items]      
Excess of without planned expenditures   $ 750,000,000.0  
Leverage ratio to EBITDA   3.50  
Secured debt limit, percentage of total consolidated assets   15.00%  
Line of Credit | Debt Covenant 2      
Short-term Debt [Line Items]      
Leverage ratio to EBITDA   4.00  
Term notes | Senior Notes, Due 2051      
Short-term Debt [Line Items]      
Long-term debt $ 500,000,000.0    
Stated percentage (as a percent) 3.50%    
Term notes | Senior Notes, Due 2022      
Short-term Debt [Line Items]      
Stated percentage (as a percent) 3.40%    
Repayments of debt $ 300,000,000.0    
Revolving credit facility      
Short-term Debt [Line Items]      
Total authorized program   $ 1,200,000,000  
Credit facility outstanding   0 $ 0
Line of credit facility, current borrowing capacity   331,900,000  
Revolving credit facility | Line of Credit      
Short-term Debt [Line Items]      
Total authorized program   1,200,000,000  
Letter of Credit      
Short-term Debt [Line Items]      
Credit facility outstanding   $ 0