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Condensed Notes to the Financial Statements (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Money Pool [Abstract]        
Schedule of Guarantor Obligations  
Guarantees and bond indemnities issued and outstanding as of Dec. 31, 2019:
(Millions of Dollars)
 
Guarantor
 
Guarantee
Amount
 
Current
Exposure
 
Triggering
Event
Guarantee of loan for Hiawatha Collegiate High School (a)
 
Xcel Energy Inc.
 
$
1.0

 
—

 
(c) 
Guarantee performance and payment of surety bonds for Xcel Energy Inc.’s utility subsidiaries (b)
 
Xcel Energy Inc.
 
60.4

 
(e) 
 
(d) 

(a) 
The term of this guarantee expires the earlier of 2024 or full repayment of the loan.
(b) 
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.
(c) 
Nonperformance and/or nonpayment.
(d) 
Per the indemnity agreement between Xcel Energy Inc. and the various surety companies, surety companies have the discretion to demand that collateral be posted.
(e) 
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. 		   
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding $ 62,000,000 $ 62,000,000 $ 69,000,000  
Payment or Performance Guarantee | Loan for Hiawatha Collegiate High School [Member]        
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding [1] 1,000,000.0 1,000,000.0    
Current exposure under these guarantees [1] 0 0    
Payment or Performance Guarantee | Surety Bonds        
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding [2] 60,400,000 60,400,000    
Xcel Energy Inc.        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 370,000,000 370,000,000 309,000,000  
Accounts Payable 0 0 0  
Dividends [Abstract]        
Cash dividends paid to Xcel Energy by subsidiaries   2,987,000,000 1,097,000,000 $ 1,063,000,000
Money Pool [Abstract]        
Loan outstanding at period end 39,000,000 39,000,000 0 85,000,000
Average loan outstanding 35,000,000 47,000,000 71,000,000 38,000,000
Maximum loan outstanding $ 125,000,000 $ 250,000,000 $ 243,000,000 $ 226,000,000
Weighted average interest rate, computed on a daily basis (percentage) 1.67% 2.15% 1.95% 1.13%
Weighted average interest rate at period end (percentage) 1.63% 1.63%   1.18%
Money pool interest income $ 0.0147 $ 1,000,000.0 $ 1,400,000 $ 400,000
Xcel Energy Inc. | NSP Minnesota        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 60,000,000 60,000,000 117,000,000  
Accounts Payable 0 0 0  
Xcel Energy Inc. | NSP-Wisconsin        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 17,000,000 17,000,000 3,000,000  
Accounts Payable 0 0 0  
Xcel Energy Inc. | PSCo        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 78,000,000 78,000,000 29,000,000  
Accounts Payable 0 0 0  
Xcel Energy Inc. | SPS        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 47,000,000 47,000,000 39,000,000  
Accounts Payable 0 0 0  
Xcel Energy Inc. | Xcel Energy Services Inc.        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 112,000,000 112,000,000 96,000,000  
Accounts Payable 0 0 0  
Xcel Energy Inc. | Xcel Energy Ventures Inc.        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 25,000,000 25,000,000 13,000,000  
Accounts Payable 0 0 0  
Xcel Energy Inc. | Other Subsidiaries        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 31,000,000 31,000,000 12,000,000  
Accounts Payable $ 0 $ 0 $ 0  
[1]
The term of this guarantee expires the earlier of 2024 or full repayment of the loan.
[2]
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.