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Borrowings and Other Financing Instruments Revolving Credit Facilities (Details) - Revolving Credit Facility [Member] - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Credit Facility [1] $ 3,100  
Outstanding [2] 585  
Available 2,515  
Direct advances on the credit facility outstanding 0 $ 0
PSCo    
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] 10  
Available 490  
SPS    
Line of Credit Facility [Line Items]    
Credit Facility [1] 500  
Outstanding [2] 42  
Available 458  
NSP-Wisconsin    
Line of Credit Facility [Line Items]    
Credit Facility [1] 150  
Outstanding [2] 76  
Available 74  
Xcel Energy Inc.    
Line of Credit Facility [Line Items]    
Credit Facility [1] 1,250  
Outstanding [2] 449  
Available $ 801  
[1]
Expires in June 2024.
[2]
Includes outstanding commercial paper and letters of credit.