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Borrowings and Other Financing Instruments Revolving Credit Facilities (Details) - USD ($)
Oct. 25, 2021
Sep. 30, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]      
Active gas litigation cases $ 1    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit Facility [1]   $ 3,100,000,000  
Outstanding [2]   566,000,000  
Available   2,534,000,000  
Direct advances on the credit facility outstanding   0 $ 0
Revolving Credit Facility [Member] | PSCo      
Line of Credit Facility [Line Items]      
Credit Facility [1]   700,000,000  
Outstanding [2]   8,000,000  
Available   692,000,000  
Revolving Credit Facility [Member] | NSP-Minnesota      
Line of Credit Facility [Line Items]      
Credit Facility [1]   500,000,000  
Outstanding [2]   9,000,000  
Available   491,000,000  
Revolving Credit Facility [Member] | SPS      
Line of Credit Facility [Line Items]      
Credit Facility [1]   500,000,000  
Outstanding [2]   20,000,000  
Available   480,000,000  
Revolving Credit Facility [Member] | NSP-Wisconsin      
Line of Credit Facility [Line Items]      
Credit Facility [1]   150,000,000  
Outstanding [2]   0  
Available   150,000,000  
Revolving Credit Facility [Member] | Xcel Energy Inc.      
Line of Credit Facility [Line Items]      
Credit Facility [1]   1,250,000,000  
Outstanding [2]   529,000,000  
Available   $ 721,000,000  
[1] Expires in June 2024.
[2] Includes outstanding commercial paper and letters of credit.