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Condensed Notes to the Financial Statements (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Money Pool [Abstract]        
Schedule of Guarantor Obligations  
Guarantees and bond indemnities issued and outstanding as of Dec. 31, 2022:
(Millions of Dollars)GuarantorGuarantee
Amount		Current
Exposure		Triggering
Event
Guarantee of loan for Hiawatha Collegiate High School (a)
Xcel Energy Inc.$1 — 
(b)
Guarantee of Capital Services purchase contract for solar generating equipment. (c)
Xcel Energy Inc. 98 
(d)
(b)
Guarantee performance and payment of surety bonds for Xcel Energy Inc.’s utility subsidiaries (e)
Xcel Energy Inc.61 
(f)
(g)
(a)The guarantee expires the earlier of 2024 or full repayment of the loan.
(b)Nonperformance and/or nonpayment.
(c)The guarantee expires the earlier of termination or payment of all obligations under the purchase contract.
(d)Given that the manufacturing of solar generating equipment has not yet commenced, related exposure to the payment obligations of Capital Services at Dec. 31, 2022 is immaterial.
(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 magnitude 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. 		   
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding $ 62 $ 62 $ 60  
Guarantor Obligations, Maximum Exposure, Undiscounted 62 62 60  
Payment or Performance Guarantee | Loan for Hiawatha Collegiate High School [Member]        
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding [1] 1 1    
Current exposure under these guarantees [2] 0 0    
Guarantor Obligations, Maximum Exposure, Undiscounted [1] 1 1    
Payment or Performance Guarantee | Guarantee of Capital Services purchase contract for solar generating equipment        
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding [2],[3],[4] 98 98    
Guarantor Obligations, Maximum Exposure, Undiscounted [2],[3],[4] 98 98    
Payment or Performance Guarantee | Surety Bonds        
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding [5],[6],[7] 61 61    
Guarantor Obligations, Maximum Exposure, Undiscounted [5],[6],[7] 61 61    
Xcel Energy Inc.        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 443 443 430  
Dividends [Abstract]        
Cash dividends paid to Xcel Energy by subsidiaries   1,503 1,344 $ 2,527
Money Pool [Abstract]        
Loan outstanding at period end 0 0 0 57
Average loan outstanding 1 10 16 104
Maximum loan outstanding $ 50 $ 204 $ 439 $ 350
Weighted average interest rate, computed on a daily basis (percentage) 0.01% 0.73% 0.08% 0.60%
Weighted average interest rate at period end (percentage)       0.07%
Money pool interest income $ 0 $ 0 $ 0 $ 1
Xcel Energy Inc. | NSP Minnesota        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 82 82 104  
Xcel Energy Inc. | NSP-Wisconsin        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 17 17 25  
Xcel Energy Inc. | PSCo        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 111 111 91  
Xcel Energy Inc. | SPS        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 61 61 58  
Xcel Energy Inc. | Xcel Energy Services Inc.        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 145 145 125  
Xcel Energy Inc. | Other Subsidiaries        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable $ 27 $ 27 $ 27  
[1] The guarantee expires the earlier of 2024 or full repayment of the loan.
[2] Nonperformance and/or nonpayment.
[3] Given that the manufacturing of solar generating equipment has not yet commenced, related exposure to the payment obligations of Capital Services at Dec. 31, 2022 is immaterial.
[4] The guarantee expires the earlier of termination or payment of all obligations under the purchase contract.
[5] Due to the magnitude 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.
[6] Per the indemnity agreement between Xcel Energy Inc. and the various surety companies, surety companies have the discretion to demand that collateral be posted.
[7] 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.