Operating Segments (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following table presents segment information pertaining to DESC’s operations:

Year Ended December 31,	Dominion Energy South Carolina		Corporate and Other			Consolidated Total
(millions)
2020
External revenue	$	2,739	$	—		$	2,739
Depreciation and amortization		474		—			474
Interest and related charges		223		6			229
Income tax expense (benefit)		107		(36	)		71
Comprehensive income (loss) available (attributable) to    common shareholder		410		(113	)		297
Capital expenditures		742		—			742
Total assets (billions)		14.5		—			14.5
2019
External revenue	$	2,937	$	(1,008	)	$	1,929
Depreciation and amortization		452		(2	)		450
Interest and related charges		247		13			260
Income tax expense (benefit)		163		(175	)		(12	)
Comprehensive income (loss) available (attributable) to    common shareholder		408		(1,647	)		(1,239	)
Capital expenditures		497		—			497
Total assets (billions)		14.3		—			14.3
2018
External revenue	$	2,763	$	(1	)	$	2,762
Depreciation and amortization		327		—			327
Interest and related charges		306		(3	)		303
Income tax expense (benefit)		98		(514	)		(416	)
Comprehensive income (loss) available (attributable) to    common shareholder		304		(917	)		(613	)
Capital expenditures		633		—			633