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Borrowings and Other Financing Instruments Revolving Credit Facilities (Details) - Revolving Credit Facility [Member] - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Credit Facility [1] $ 3,100  
Outstanding [2] 230  
Available 2,870  
Direct advances on the credit facility outstanding 0 $ 0
PSCo [Member]    
Line of Credit Facility [Line Items]    
Credit Facility [1] 700  
Outstanding [2] 8  
Available 692  
NSP-Minnesota    
Line of Credit Facility [Line Items]    
Credit Facility [1] 500  
Outstanding [2] 2  
Available 498  
SPS    
Line of Credit Facility [Line Items]    
Credit Facility [1] 500  
Outstanding [2] 10  
Available 490  
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] 1,250  
Outstanding [2] 210  
Available $ 1,040  
[1] Expires in June 2024.
[2] Includes outstanding commercial paper and letters of credit.