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Equity (Narrative) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2025
$ / shares
May 15, 2024
shares
Mar. 15, 2024
shares
Oct. 31, 2025
USD ($)
$ / shares
shares
May 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2025
$ / shares
shares
Feb. 28, 2025
USD ($)
Dec. 31, 2024
Jun. 30, 2024
shares
May 31, 2024
shares
Mar. 31, 2024
shares
Dec. 31, 2023
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
$ / shares
shares
Oct. 01, 2025
USD ($)
Stock Issued During Period, Shares, Treasury Stock Reissued | shares                                     1,456,014    
Common Stock, Dividends, Per Share, Declared | $ / shares                         $ 0.60     $ 0.57     $ 1.80 $ 1.70  
Dividends, Common Stock, Cash                         $ 267,939 $ 258,467 $ 258,249 $ 241,720 $ 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                         94,446     3,485,736     901,408 3,164,908  
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                         2,100,000           2,100,000    
System Energy [Member]                                          
Dividends, Common Stock, Cash         $ 30,000   $ 20,000                            
Subsequent Event [Member]                                          
Common Stock, Dividends, Per Share, Declared | $ / shares $ 0.64                                        
Subsequent Event [Member] | Common Stock [Member] | Equity Distribution Program [Member]                                          
Forward Contract Indexed to Equity, Settlement, Cash, Amount                                         $ 332,000
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares       $ 58.30                                  
Forward Contract Indexed to Issuer's Equity, Shares | shares       5,692,604                                  
Payments of Stock Issuance Costs       $ 400