AFFILIATED TRANSACTIONS (Details) - USD ($)		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Due to Related Parties				$ 353,000,000
Utilities Operating Expense, Fuel Used, Affiliate		$ 33,200	$ 31,300,000
Electric Domestic Regulated Revenues - Affiliate		1,100	1,200,000
Reclass Other Taxes - nonconsolidated affiliate		2,400,000	2,200,000
Canadys Refined Coal [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party		$ 5,100,000		6,800,000
Equity Method Investment, Ownership Percentage		40.00%
Related Party Transaction, Purchases from Related Party		$ 28,100,000	32,500,000
Sales to Affiliates		27,900,000	32,300,000
Due to Related Parties		5,100,000		6,800,000
Solar Affiliates [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current		700,000
Related Party Transaction, Purchases from Related Party		1,200,000
Dominion Energy Carolina Gas Transmission LLC [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current		5,500,000
Related Party Transaction, Purchases from Related Party		14,500,000
Utilities Operating Expense, Fuel Used, Affiliate		11,000,000
Related Party Purchases - Cost of Gas		4,100,000
DEGM [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current		11,000,000		14,100,000
DESS [Member]
Related Party Transaction [Line Items]
Capitalized Related Costs		9,000,000	8,000,000
Due to Affiliate, Current		40,500,000		$ 37,700,000
Related Party Transaction, Purchases from Related Party	[1]	$ 58,400,000
Related Party Transaction, Expenses from Transactions with Related Party	[1]		$ 59,000,000

[1] Includes capitalized expenditures of $9 million and $8 million for the three months ended March 31, 2019 and 2018, respectively.