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Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail) $ in Millions | Mar. 31, 2019 USD ($)
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Lessee Lease Disclosure [Line Items] |
Finance lease assets, accumulated amortization | $ 29
Virginia Electric and Power Company |
Lessee Lease Disclosure [Line Items] |
Finance lease assets, accumulated amortization | 2
Dominion Energy Gas Holdings, LLC |
Lessee Lease Disclosure [Line Items] |
Finance lease assets, accumulated amortization | 1
Operating lease assets | 25
Operating Lease Liabilities | $ 25

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