Revenues (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

PSCo’s operating revenues consisted of the following:

	Year Ended Dec. 31, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	1,073	$	650	$	12	$	1,735
C&I	1,512		225		27		1,764
Other	48		—		—		48
Total retail	2,633		875		39		3,547
Wholesale	212		—		—		212
Transmission	62		—		—		62
Other	56		125		—		181
Total revenue from contracts with customers	2,963		1,000		39		4,002
Alternative revenue and other	153		24		4		181
Total revenues	$	3,116	$	1,024	$	43	$	4,183

	Year Ended Dec. 31, 2019
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	1,006	$	750	$	11	$	1,767
C&I	1,579		281		28		1,888
Other	50		—		—		50
Total retail	2,635		1,031		39		3,705
Wholesale	166		—		—		166
Transmission	52		—		—		52
Other	32		107		—		139
Total revenue from contracts with customers	2,885		1,138		39		4,062
Alternative revenue and other	148		23		4		175
Total revenues	$	3,033	$	1,161	$	43	$	4,237

	Year Ended Dec. 31, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	991	$	606	$	11	$	1,608
C&I	1,560		224		25		1,809
Other	48		—		—		48
Total retail	2,599		830		36		3,465
Wholesale	175		—		—		175
Transmission	54		—		—		54
Other	55		84		—		139
Total revenue from contracts with customers	2,883		914		36		3,833
Alternative revenue and other	148		101		4		253
Total revenues	$	3,031	$	1,015	$	40	$	4,086