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Borrowings and Other Financing Instruments Letters of Credit (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]    
Amount outstanding at period end $ 785 $ 813
Xcel Energy Inc.    
Line of Credit Facility [Line Items]    
Amount outstanding at period end $ 165 $ 231
Letter of Credit    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Expiration Period 1 year  
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity [1] $ 3,550  
Revolving Credit Facility [Member] | Xcel Energy Inc.    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity [1] $ 1,500  
[1] These credit facilities mature in September 2027.