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Borrowings and Other Financing Instruments Revolving Credit Facilities (Details) - Revolving Credit Facility [Member] - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Line of Credit Facility [Line Items]      
Credit Facility [1] $ 4,750    
Outstanding [2] 1,404    
Available 3,346    
Direct advances on the credit facility outstanding 0   $ 0
PSCo      
Line of Credit Facility [Line Items]      
Credit Facility [1] 1,200 $ 700  
Outstanding [2] 30    
Available 1,170    
NSP-Minnesota      
Line of Credit Facility [Line Items]      
Credit Facility [1] 800 700  
Outstanding [2] 44    
Available 756    
SPS      
Line of Credit Facility [Line Items]      
Credit Facility [1] 600 500  
Outstanding [2] 0    
Available 600    
NSP-Wisconsin      
Line of Credit Facility [Line Items]      
Credit Facility [1] 150    
Outstanding [2] 0    
Available 150    
Xcel Energy Inc.      
Line of Credit Facility [Line Items]      
Credit Facility [1] 2,000 $ 1,500  
Outstanding [2] 1,330    
Available $ 670    
[1] Expires in December 2029.
[2] Includes outstanding commercial paper and letters of credit.