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Leases (Scheduled Maturities of Lease Liabilities) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Jul. 31, 2016
Maturity of Operating Lease Liabilities
Maturity of Lease Liabilities, Operating, 2019	$ 18
Maturity of Lease Liabilities, Operating, 2020	68
Maturity of Lease Liabilities, Operating, 2021	61
Maturity of Lease Liabilities, Operating, 2022	50
Maturity of Lease Liabilities, Operating, 2023	40
Maturity of Lease Liabilities, Operating, After 2023	538
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	775
Present value adjustment, Operating	(323)
Present value of lease liabilities, Operating	452
Maturity of Finance Lease Liabilities
Maturity of Lease Liabilities, Finance, 2019	10
Maturity of Lease Liabilities, Finance, 2020	39
Maturity of Lease Liabilities, Finance, 2021	33
Maturity of Lease Liabilities, Finance, 2022	31
Maturity of Lease Liabilities, Finance, 2023	28
Maturity of Lease Liabilities, Finance, After 2023	49
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	190
Present value adjustment, Finance	(28)
Present value of lease liabilities, Finance	162	$ 67
Virginia Electric and Power Company
Maturity of Operating Lease Liabilities
Maturity of Lease Liabilities, Operating, 2019	8
Maturity of Lease Liabilities, Operating, 2020	33
Maturity of Lease Liabilities, Operating, 2021	29
Maturity of Lease Liabilities, Operating, 2022	23
Maturity of Lease Liabilities, Operating, 2023	18
Maturity of Lease Liabilities, Operating, After 2023	160
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	271
Present value adjustment, Operating	(89)
Present value of lease liabilities, Operating	182
Maturity of Finance Lease Liabilities
Maturity of Lease Liabilities, Finance, 2019	1
Maturity of Lease Liabilities, Finance, 2020	3
Maturity of Lease Liabilities, Finance, 2021	3
Maturity of Lease Liabilities, Finance, 2022	3
Maturity of Lease Liabilities, Finance, 2023	2
Maturity of Lease Liabilities, Finance, After 2023	4
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	16
Present value adjustment, Finance	(2)
Present value of lease liabilities, Finance	14
Dominion Energy Gas Holdings, LLC
Maturity of Operating Lease Liabilities
Maturity of Lease Liabilities, Operating, 2019	5
Maturity of Lease Liabilities, Operating, 2020	13
Maturity of Lease Liabilities, Operating, 2021	11
Maturity of Lease Liabilities, Operating, 2022	9
Maturity of Lease Liabilities, Operating, 2023	6
Maturity of Lease Liabilities, Operating, After 2023	25
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	69
Present value adjustment, Operating	(13)
Present value of lease liabilities, Operating	56
Maturity of Finance Lease Liabilities
Maturity of Lease Liabilities, Finance, 2019	1
Maturity of Lease Liabilities, Finance, 2020	2
Maturity of Lease Liabilities, Finance, 2021	2
Maturity of Lease Liabilities, Finance, 2022	2
Maturity of Lease Liabilities, Finance, 2023	2
Maturity of Lease Liabilities, Finance, After 2023	3
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	12
Present value adjustment, Finance	(2)
Present value of lease liabilities, Finance	$ 10

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