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Equity (Narrative) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Apr. 07, 2025
$ / shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Feb. 28, 2025
USD ($)
Dec. 31, 2024
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
$ / shares
shares
Stock Issued During Period, Shares, Treasury Stock Reissued         1,193,693  
Common Stock, Dividends, Per Share, Declared | $ / shares         $ 0.60 $ 0.57
Dividends, Common Stock, Cash | $         $ 258,249 $ 240,959
Stockholders' Equity Note, Stock Split, Conversion Ratio       2    
Forward Contracts [Member]            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount         185,897 3,820,510
Equity Distribution Program [Member]            
Forward Contract Indexed to Equity, Settlement, Cash, Amount | $   $ 2,800,000     $ 2,800,000  
Equity Distribution Sales Agreement, Maximum Aggregate Gross Sales Price | $   $ 4,500,000     $ 4,500,000  
Equity Distribution Sales Agreement, Increase in Maximum Aggregate Gross Sales Price | $     $ 1,500,000      
Common Stock [Member] | Equity Distribution Program [Member]            
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares   $ 84.77        
Stock Issued During Period, Shares, New Issues         0 0
Forward Contract Indexed to Issuer's Equity, Shares   2,713,790        
Common Stock [Member] | Equity Offering            
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares   $ 81.87        
Forward Contract Indexed to Issuer's Equity, Shares   17,800,000        
Forward Contract Indexed to Equity, Settlement, Number of Shares   700,000     700,000  
System Energy [Member]            
Dividends, Common Stock, Cash | $     $ 20,000      
Subsequent Event [Member]            
Common Stock, Dividends, Per Share, Declared | $ / shares $ 0.60