Operating Revenue (Tables)

12 Months Ended

Dec. 31, 2020

Revenue Recognition And Deferred Revenue [Abstract]

Operating Revenue Subsequent to the Adoption of Guidance for Revenue Recognition from Contracts with Customers

DESC’s operating revenue consists of the following:

Year Ended December 31,	2020				2019
(millions)	Electric		Gas		Electric		Gas
Customer class:
Residential	$	1,127	$	201	$	669	$	194
Commercial		746		103		507		111
Industrial		341		65		224		81
Other		123		18		116		18
Revenues from contracts with customers		2,337		387		1,516		404
Other revenues		15		—		9		—
Total Operating Revenues	$	2,352	$	387	$	1,525	$	404

Balance and Activity Related to Contract Costs Deferred as Regulatory Assets

Balances and activity related to contract costs deferred as regulatory assets were as follows:

	Regulatory Assets
(millions)	2020			2019
Beginning balance, January 1	$	13		$	15
Amortization		(1	)		(2	)
Ending balance, December 31	$	12		$	13