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Schedule I, Condensed Financial Statements of Xcel Energy Inc, Notes to Condensed Financial Statements (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Money Pool [Abstract]        
Schedule of Guarantor Obligations  
Guarantees and bond indemnities issued and outstanding as of Dec. 31, 2018:
(Millions of Dollars)
 
Guarantor
 
Guarantee
Amount
 
Current
Exposure
 
Triggering
Event
Guarantee of the indemnification obligations of Xcel Energy Services Inc. under the aircraft leases (a)
 
Xcel Energy Inc.
 
$
11.0

 
$
—

 
(d) 
Guarantee of loan for Hiawatha Collegiate High School (b)
 
Xcel Energy Inc.
 
1.0

 
—

 
(d) 
Total guarantees issued
 
 
 
12.0

 
$
—

 
 
Guarantee performance and payment of surety bonds for Xcel Energy Inc.’s utility subsidiaries (c)
 
Xcel Energy Inc.
 
$
51.1

 
(f) 
 
(e) 
    
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding $ 12.0 $ 12.0    
Current exposure under these guarantees 0.0 0.0    
Obligations Under Aircraft Leases | Payment or Performance Guarantee        
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding 11.0 11.0    
Current exposure under these guarantees 0.0 0.0    
Loan for Hiawatha Collegiate High School [Member] | Payment or Performance Guarantee        
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding 1.0 1.0    
Current exposure under these guarantees 0.0 $ 0.0    
Guarantee Expiration Date (year)   2024    
Surety Bonds | Payment or Performance Guarantee        
Guarantor Obligations [Line Items]        
Guarantees issued and outstanding 51.1 $ 51.1    
Minimum | Obligations Under Aircraft Leases | Payment or Performance Guarantee        
Guarantor Obligations [Line Items]        
Guarantee Expiration Date (year)   2021    
Maximum | Obligations Under Aircraft Leases | Payment or Performance Guarantee        
Guarantor Obligations [Line Items]        
Guarantee Expiration Date (year)   2023    
Xcel Energy Inc.        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 309.0 $ 309.0 $ 302.0  
Accounts Payable 0.0 0.0 0.0  
Dividends [Abstract]        
Cash dividends paid to Xcel Energy by subsidiaries   1,097.0 1,063.0 $ 923.0
Money Pool [Abstract]        
Loan outstanding at period end 0.0 0.0 85.0 0.0
Average loan outstanding 59.0 71.0 38.0 66.0
Maximum loan outstanding $ 172.0 $ 243.0 $ 226.0 $ 211.0
Weighted average interest rate, computed on a daily basis (percentage) 2.22% 1.95% 1.13% 0.69%
Weighted average interest rate at period end (percentage)     1.18%  
Money pool interest income $ 0.3 $ 1.4 $ 0.4 $ 0.5
Xcel Energy Inc. | NSP-Minnesota        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 117.0 117.0 68.0  
Accounts Payable 0.0 0.0 0.0  
Xcel Energy Inc. | NSP-Wisconsin        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 3.0 3.0 13.0  
Accounts Payable 0.0 0.0 0.0  
Xcel Energy Inc. | PSCo        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 29.0 29.0 69.0  
Accounts Payable 0.0 0.0 0.0  
Xcel Energy Inc. | SPS        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 39.0 39.0 26.0  
Accounts Payable 0.0 0.0 0.0  
Xcel Energy Inc. | Xcel Energy Services Inc.        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 96.0 96.0 95.0  
Accounts Payable 0.0 0.0 0.0  
Xcel Energy Inc. | Xcel Energy Ventures Inc.        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 13.0 13.0 14.0  
Accounts Payable 0.0 0.0 0.0  
Xcel Energy Inc. | Other Subsidiaries        
Accounts Receivable and Payable with Affiliates [Abstract]        
Accounts Receivable 12.0 12.0 17.0  
Accounts Payable $ 0.0 $ 0.0 $ 0.0