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Borrowings and Other Financing Instruments, Credit Facilities (Details) (Credit Facilities, USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Line of Credit Facility [Line Items]    
Credit Facility $ 2,450.0 [1]  
Drawn 768.4 [2]  
Available 1,681.6  
Direct advances on the credit facility outstanding 0 0
Xcel Energy Inc.
   
Line of Credit Facility [Line Items]    
Credit Facility 800.0 [1]  
Drawn 436.0 [2]  
Available 364.0  
PSCo
   
Line of Credit Facility [Line Items]    
Credit Facility 700.0 [1]  
Drawn 259.5 [2]  
Available 440.5  
NSP-Minnesota
   
Line of Credit Facility [Line Items]    
Credit Facility 500.0 [1]  
Drawn 23.9 [2]  
Available 476.1  
SPS
   
Line of Credit Facility [Line Items]    
Credit Facility 300.0 [1]  
Drawn 41.0 [2]  
Available 259.0  
NSP-Wisconsin
   
Line of Credit Facility [Line Items]    
Credit Facility 150.0 [1]  
Drawn 8.0 [2]  
Available $ 142.0  
[1] These credit facilities have been amended to expire in October 2019.
[2] Includes outstanding commercial paper and letters of credit.