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Equity (Narrative) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 25, 2025
$ / shares
May 15, 2024
shares
Mar. 15, 2024
shares
May 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2025
$ / shares
shares
Feb. 28, 2025
USD ($)
Dec. 31, 2024
Jun. 30, 2024
shares
May 31, 2024
shares
Mar. 31, 2024
shares
Dec. 31, 2023
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Mar. 31, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
$ / shares
shares
Stock Issued During Period, Shares, Treasury Stock Reissued | shares                               1,268,179  
Common Stock, Dividends, Per Share, Declared | $ / shares                       $ 0.60   $ 0.57   $ 1.20 $ 1.13
Dividends, Common Stock, Cash | $                       $ 258,467 $ 258,249 $ 241,296 $ 240,959    
Stockholders' Equity Note, Stock Split, Conversion Ratio             2                    
Forward Contracts [Member]                                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares                       2,423,880   2,897,964   1,304,889 2,942,440
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 Equity, Settlement, Cash, Amount | $       $ 805,669                          
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares       $ 51.78 $ 84.77                        
Stock Issued During Period, Shares, New Issues | shares                               0 0
Forward Contract Indexed to Issuer's Equity, Shares | shares   2,556,832 569,844   2,713,790     2,140,006 2,466,470 2,320,830 5,506,492            
Forward Contract Indexed to Equity, Settlement, Number of Shares | shares       15,560,474                          
Payments of Stock Issuance Costs | $       $ 1,000                          
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 | shares         17,800,000                        
Forward Contract Indexed to Equity, Settlement, Number of Shares | shares         200,000               200,000        
System Energy [Member]                                  
Dividends, Common Stock, Cash | $       $ 30,000   $ 20,000                      
Subsequent Event [Member]                                  
Common Stock, Dividends, Per Share, Declared | $ / shares $ 0.60