Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2020

Revenue From Contract With Customer [Abstract]

Disaggregation of Revenue

DESC has disaggregated operating revenues by customer class as follows:

	Three Months Ended				Three Months Ended
	March 31, 2020				March 31, 2019
(millions)	Electric		Gas		Electric			Gas
Customer class:
Residential	$	252	$	79	$	(271	)	$	78
Commercial		175		33		(139	)		38
Industrial		80		17		(82	)		26
Other		30		4		10			3
Revenues from contracts with    customers		537		133		(482	)		145
Other revenues		2		—		2			—
Total Operating Revenues	$	539	$	133	$	(480	)	$	145