Operating Revenue (Tables)

6 Months Ended

Jun. 30, 2025

Revenue Recognition and Deferred Revenue [Abstract]

Disaggregation of Revenue

DESC’s revenue consists of the following:

	Three Months Ended June 30, 2025				Three Months Ended June 30, 2024				Six Months Ended June 30, 2025				Six Months Ended June 30, 2024
(millions)	Electric		Gas		Electric		Gas		Electric		Gas		Electric		Gas
Customer class:
Residential	$	346	$	55	$	294	$	48	$	717	$	206	$	577	$	165
Commercial		235		26		208		25		463		80		396		66
Industrial		112		3		94		17		221		30		181		35
Other		35		12		31		6		67		20		59		12
Revenues from contracts with    customers		728		96		627		96		1,468		336		1,213		278
Other revenues		7		1		7		1		13		1		14		1
Total Operating Revenues	$	735	$	97	$	634	$	97	$	1,481	$	337	$	1,227	$	279

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)	June 30, 2025		December 31, 2024
Beginning balance	$	10	$	11
Additional costs		4		—
Amortization		—		(1	)
Ending balance	$	14	$	10