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Borrowings and Other Financing Instruments (Tables)
3 Months Ended
Mar. 31, 2015
Borrowings and Other Financing Instruments [Abstract]  
Credit Facilities
At March 31, 2015, PSCo had the following committed credit facility available (in millions of dollars):
Credit Facility (a)
 
Drawn (b)
 
Available
$
700

 
$
149

 
$
551


(a)    This credit facility expires in October 2019.
(b)    Includes outstanding commercial paper and letters of credit.

Money Pool  
Borrowings and Other Financing Instruments [Abstract]  
Short-Term Borrowings
Money pool borrowings for PSCo were as follows:
(Amounts in Millions, Except Interest Rates)
 
Three Months Ended March 31, 2015
 
Twelve Months Ended Dec. 31, 2014
Borrowing limit
 
$
250

 
$
250

Amount outstanding at period end
 

 

Average amount outstanding
 

 
4

Maximum amount outstanding
 
9

 
97

Weighted average interest rate, computed on a daily basis
 
N/A

 
0.25
%
Weighted average interest rate at period end
 
N/A

 
N/A

Commercial Paper  
Borrowings and Other Financing Instruments [Abstract]  
Short-Term Borrowings
Commercial paper outstanding for PSCo was as follows:
(Amounts in Millions, Except Interest Rates)
 
Three Months Ended March 31, 2015
 
Twelve Months Ended Dec. 31, 2014
Borrowing limit
 
$
700

 
$
700

Amount outstanding at period end
 
142

 
382

Average amount outstanding
 
288

 
167

Maximum amount outstanding
 
449

 
393

Weighted average interest rate, computed on a daily basis
 
0.51
%
 
0.31
%
Weighted average interest rate at period end
 
0.57

 
0.65