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Borrowings and Other Financing Instruments Revolving Credit Facilities (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Nov. 30, 2024
Line of Credit Facility [Line Items]      
Shares Issued, Price Per Share     $ 64.44
Forward Equity Agreements      
Line of Credit Facility [Line Items]      
Common stock, initial shares in an agreement     18,300
Common stock, additional shares in an agreement     2,800
Period End Settlement Price, in Shares 21,100    
Period End Settlement Price, in Cash $ 1,350,000    
Period End Net Cash Settlement Price 116,000    
Period End Net Share Settlement Price 1,700    
Expected Settlement Price 1,360,000    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit Facility [1] 3,550,000    
Outstanding [2] 760,000    
Available 2,790,000    
Direct advances on the credit facility outstanding 0 $ 0  
Revolving Credit Facility [Member] | PSCo      
Line of Credit Facility [Line Items]      
Credit Facility [1] 700,000    
Outstanding [2] 54,000    
Available 646,000    
Revolving Credit Facility [Member] | NSP-Minnesota      
Line of Credit Facility [Line Items]      
Credit Facility [1] 700,000    
Outstanding [2] 77,000    
Available 623,000    
Revolving Credit Facility [Member] | SPS      
Line of Credit Facility [Line Items]      
Credit Facility [1] 500,000    
Outstanding [2] 209,000    
Available 291,000    
Revolving Credit Facility [Member] | NSP-Wisconsin      
Line of Credit Facility [Line Items]      
Credit Facility [1] 150,000    
Outstanding [2] 0    
Available 150,000    
Revolving Credit Facility [Member] | Xcel Energy Inc.      
Line of Credit Facility [Line Items]      
Credit Facility [1] 1,500,000    
Outstanding [2] 420,000    
Available $ 1,080,000    
[1] Expires in September 2027.
[2] Includes outstanding commercial paper and letters of credit.