Borrowings and Other Financing Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

At Sept. 30, 2017, PSCo had the following committed credit facility available (in millions of dollars):

Credit Facility (a)		Drawn(b)		Available
$	700	$	4	$	696

^(a)    This credit facility expires in June 2021.

^(b)    Includes outstanding 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 Sept. 30, 2017		Year Ended Dec. 31, 2016
Borrowing limit	$	250	$	250
Amount outstanding at period end	—		—
Average amount outstanding	—		21
Maximum amount outstanding	—		141
Weighted average interest rate, computed on a daily basis	N/A		0.73		%
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 Sept. 30, 2017		Year Ended Dec. 31, 2016
Borrowing limit	$	700	$	700
Amount outstanding at period end	—		129
Average amount outstanding	—		24
Maximum amount outstanding	—		154
Weighted average interest rate, computed on a daily basis	N/A		0.70		%
Weighted average interest rate at period end	N/A		0.95