Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2021

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, 2021				March 31, 2020
(millions)	Electric		Gas		Electric		Gas
Customer class:
Residential	$	275	$	98	$	252	$	79
Commercial		175		39		175		33
Industrial		88		22		80		17
Other		33		5		30		4
Revenues from contracts with    customers		571		164		537		133
Other revenues		8		1		2		—
Total Operating Revenues	$	579	$	165	$	539	$	133