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Borrowings and Other Financing Instruments Revolving Credit Facilities (Details) - Revolving Credit Facility [Member] - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Line of Credit Facility [Line Items]    
Credit Facility [1] $ 3,550  
Outstanding [2] 197  
Available 3,353  
Direct advances on the credit facility outstanding 0 $ 0
PSCo    
Line of Credit Facility [Line Items]    
Credit Facility [1] 700  
Outstanding [2] 26  
Available 674  
NSP-Minnesota    
Line of Credit Facility [Line Items]    
Credit Facility [1] 700  
Outstanding [2] 11  
Available 689  
SPS    
Line of Credit Facility [Line Items]    
Credit Facility [1] 500  
Outstanding [2] 2  
Available 498  
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] 1,500  
Outstanding [2] 158  
Available $ 1,342  
[1] Expires in September 2027.
[2] Includes outstanding commercial paper and letters of credit.