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Borrowings and Other Financing Instruments Credit Facilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Line of Credit Facility [Line Items]    
Amount outstanding at period end $ 785 $ 813
Letter of Credit    
Line of Credit Facility [Line Items]    
Amount outstanding at period end 44 43
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity [1] 3,550  
Drawn [2] 829  
Available 2,721  
Direct advances on the credit facility outstanding $ 0 0
Parent [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed 65.00%  
Line Of Credit Facility Minimum Threshhold Percentage Of Subsidiary Assets To Consolidated Assets Required To Initiate Cross Default Provisions 15.00%  
Line of Credit Facility, Minimum Amount of Indebtedness in Default to Initiate Cross Default Provisions $ 75  
Xcel Energy Inc.    
Line of Credit Facility [Line Items]    
Amount outstanding at period end 165 $ 231
Xcel Energy Inc. | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity [1] 1,500  
Drawn [2] 165  
Available $ 1,335  
Xcel Energy Inc. | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) [3],[4] 59.80% 59.70%
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased [4],[5] $ 350  
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval [4],[6] 2  
NSP-Wisconsin | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) [3] 48.20% 47.40%
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval [6] 1  
Line of Credit Facility, Maximum Borrowing Capacity [1] $ 150  
Drawn [2] 60  
Available $ 90  
NSP Minnesota | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) [3] 47.70% 47.70%
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased [5] $ 150  
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval [6] 2  
Line of Credit Facility, Maximum Borrowing Capacity [1] $ 700  
Drawn [2] 180  
Available $ 520  
SPS | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) [3] 46.10% 45.70%
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased [5] $ 50  
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval [6] 2  
Line of Credit Facility, Maximum Borrowing Capacity [1] $ 500  
Drawn [2] 75  
Available $ 425  
PSCo | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) [3] 44.80% 44.00%
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased [5] $ 100  
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval [6] 2  
Line of Credit Facility, Maximum Borrowing Capacity [1] $ 700  
Drawn [2] 349  
Available $ 351  
[1] These credit facilities mature in September 2027.
[2] Includes outstanding commercial paper and letters of credit.
[3] Each credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.
[4] The Xcel Energy Inc. credit facility has a cross-default provision that Xcel Energy Inc. would be in default on its borrowings under the facility if it or any of its subsidiaries (except NSP-Wisconsin as long as its total assets do not comprise more than 15% of Xcel Energy’s consolidated total assets) default on indebtedness in an aggregate principal amount exceeding $75 million.
[5] Amounts authorized by state commissions in respective jurisdictions.
[6] All extension requests are subject to majority bank group approval.