Borrowings and Other Financing Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

At March 31, 2017, PSCo had the following committed credit facility available (in millions of dollars):

Credit Facility (a)		Drawn(b)		Available
$	700	$	34	$	666

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

^(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, 2017			Year Ended Dec. 31, 2016
Borrowing limit	$	250		$	250
Amount outstanding at period end	—			—
Average amount outstanding	1			21
Maximum amount outstanding	20			141
Weighted average interest rate, computed on a daily basis	0.92		%	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 March 31, 2017			Year Ended Dec. 31, 2016
Borrowing limit	$	700		$	700
Amount outstanding at period end	31			129
Average amount outstanding	109			24
Maximum amount outstanding	268			154
Weighted average interest rate, computed on a daily basis	0.97		%	0.70		%
Weighted average interest rate at period end	1.10			0.95