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Condensed Notes to the Financial Statements (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Money Pool [Abstract]        
Guarantor Obligations, Maximum Exposure, Undiscounted $ 75 $ 75 $ 62  
Schedule of Guarantor Obligations  
Guarantees and bond indemnities issued and outstanding as of Dec. 31, 2023:
(Millions of Dollars)GuarantorGuarantee
Amount		Current
Exposure		Triggering
Event
Guarantees of Capital Services purchase contracts for wind and solar generating equipment (a)
Xcel Energy Inc. 951 
(b)
(c)
Guarantees of Xcel Energy Inc.’s utility subsidiaries’ performance on tax credit sale agreements Xcel Energy Inc.100 
(d)
(c)
Guarantee performance and payment of surety bonds for Xcel Energy Inc.’s utility subsidiaries (e)
Xcel Energy Inc.75 
(f)
(g)
(a)Guarantees expire upon the satisfaction of all buyer obligations under the purchase contracts.
(b)Given that the manufacturing of equipment has not yet commenced, related exposure to the performance obligations of Capital Services at Dec. 31, 2023 has been assessed as immaterial.
(c)Nonperformance and/or nonpayment.
(d)Exposure to the performance obligations of the utility subsidiaries has been assessed as immaterial. The tax credit sales transactions closed as scheduled in January 2024.
(e)The surety bonds primarily relate to workers compensation benefits and utility projects. The workers compensation bonds are renewed annually and the project based bonds expire in conjunction with the completion of the related projects.
(f)Due to the number of projects associated with the surety bonds, the total current exposure of this indemnification cannot be determined. Xcel Energy Inc. believes the exposure to be significantly less than the total amount of the outstanding bonds.
(g)Per the indemnity agreement between Xcel Energy Inc. and the various surety companies, surety companies have the discretion to demand that collateral be posted.
    
Payment or Performance Guarantee | Guarantee of Capital Services purchase contract for solar generating equipment        
Money Pool [Abstract]        
Guarantor Obligations, Maximum Exposure, Undiscounted [1],[2],[3] 951 $ 951    
Payment or Performance Guarantee | Guarantees of Xcel Energy Inc.'s utility subsidiaries' performance on tax credit sale agreements        
Money Pool [Abstract]        
Guarantor Obligations, Maximum Exposure, Undiscounted [3],[4] 100 100    
Payment or Performance Guarantee | Surety Bonds        
Money Pool [Abstract]        
Guarantor Obligations, Maximum Exposure, Undiscounted [5],[6],[7] 75 75    
Xcel Energy Inc.        
Dividends [Abstract]        
Cash dividends paid to Xcel Energy by subsidiaries   1,693 1,503 $ 1,344
Money Pool [Abstract]        
Loan outstanding at period end 21 21 0 0
Average loan outstanding 90 27 10 16
Maximum loan outstanding $ 250 $ 250 $ 204 $ 439
Weighted average interest rate, computed on a daily basis (percentage) 1.34% 5.33% 0.73% 0.08%
Line of Credit Facility, Interest Rate at Period End 5.34% 5.34%    
Interest Income, Other $ 1 $ 1 $ 0 $ 0
Weighted average interest rate at period end (percentage) 5.34% 5.34%    
Other Receivable, after Allowance for Credit Loss, Current, Related and Nonrelated Party Status [Extensible Enumeration] $ 403 $ 403 443  
Xcel Energy Inc. | NSP Minnesota        
Money Pool [Abstract]        
Other Receivable, after Allowance for Credit Loss, Current, Related and Nonrelated Party Status [Extensible Enumeration] 120 120 82  
Xcel Energy Inc. | NSP-Wisconsin        
Money Pool [Abstract]        
Other Receivable, after Allowance for Credit Loss, Current, Related and Nonrelated Party Status [Extensible Enumeration] 13 13 17  
Xcel Energy Inc. | PSCo        
Money Pool [Abstract]        
Other Receivable, after Allowance for Credit Loss, Current, Related and Nonrelated Party Status [Extensible Enumeration] 44 44 111  
Xcel Energy Inc. | SPS        
Money Pool [Abstract]        
Other Receivable, after Allowance for Credit Loss, Current, Related and Nonrelated Party Status [Extensible Enumeration] 47 47 61  
Xcel Energy Inc. | Xcel Energy Services Inc.        
Money Pool [Abstract]        
Other Receivable, after Allowance for Credit Loss, Current, Related and Nonrelated Party Status [Extensible Enumeration] 144 144 145  
Xcel Energy Inc. | Other Subsidiaries        
Money Pool [Abstract]        
Other Receivable, after Allowance for Credit Loss, Current, Related and Nonrelated Party Status [Extensible Enumeration] $ 35 $ 35 $ 27  
[1] Given that the manufacturing of equipment has not yet commenced, related exposure to the performance obligations of Capital Services at Dec. 31, 2023 has been assessed as immaterial.
[2] Guarantees expire upon the satisfaction of all buyer obligations under the purchase contracts.
[3] Nonperformance and/or nonpayment.
[4] Exposure to the performance obligations of the utility subsidiaries has been assessed as immaterial. The tax credit sales transactions closed as scheduled in January 2024.
[5] Per the indemnity agreement between Xcel Energy Inc. and the various surety companies, surety companies have the discretion to demand that collateral be posted.
[6] The surety bonds primarily relate to workers compensation benefits and utility projects. The workers compensation bonds are renewed annually and the project based bonds expire in conjunction with the completion of the related projects.
[7] Due to the number of projects associated with the surety bonds, the total current exposure of this indemnification cannot be determined. Xcel Energy Inc. believes the exposure to be significantly less than the total amount of the outstanding bonds.