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Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Jan. 01, 2019 | Jul. 31, 2016
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Lessee Lease Disclosure [Line Items] |  |  |  |  |
Operating lease assets |  | $ 455 |  | $ 504 |
Finance lease assets |  | 159 | [1] |  | $ 67
Total lease assets |  | 614 |  |  |
Operating lease liabilities - current | [2] | 58 |  |  |
Finance lease liabilities - current | [3] | 30 |  |  |
Total lease liabilities - current |  | 88 |  |  |
Operating lease liabilities - noncurrent |  | 394 |  |  |
Finance lease liabilities - noncurrent | [4] | 132 |  |  |
Total lease liabilities - noncurrent |  | 526 |  |  |
Total lease liabilities |  | 614 |  |  |
Virginia Electric and Power Company |  |  |  |  |
Lessee Lease Disclosure [Line Items] |  |  |  |  |
Operating lease assets |  | 184 |  | 209 |
Finance lease assets | [1] | 15 |  |  |
Total lease assets |  | 199 |  |  |
Operating lease liabilities - current | [2] | 30 |  |  |
Finance lease liabilities - current | [3] | 3 |  |  |
Total lease liabilities - current |  | 33 |  |  |
Operating lease liabilities - noncurrent |  | 152 |  |  |
Finance lease liabilities - noncurrent | [4] | 11 |  |  |
Total lease liabilities - noncurrent |  | 163 |  |  |
Total lease liabilities |  | 196 |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Lessee Lease Disclosure [Line Items] |  |  |  |  |
Operating lease assets |  | 56 |  | $ 64 |
Finance lease assets | [1] | 10 |  |  |
Total lease assets |  | 66 |  |  |
Operating lease liabilities - current | [2] | 12 |  |  |
Finance lease liabilities - current | [3] | 2 |  |  |
Total lease liabilities - current |  | 14 |  |  |
Operating lease liabilities - noncurrent |  | 44 |  |  |
Finance lease liabilities - noncurrent | [4] | 8 |  |  |
Total lease liabilities - noncurrent |  | 52 |  |  |
Total lease liabilities |  | $ 66 |  |  |
[1] | Included in property, plant and equipment in the Companies’ Consolidated Balance Sheets, net of $39 million, $3 million and $2 million of accumulated amortization at Dominion Energy, Virginia Power and Dominion Energy Gas, respectively, at September 30, 2019.
[2] | Included in other current liabilities in the Companies’ Consolidated Balance Sheets
[3] | Included in securities due within one year in the Companies’ Consolidated Balance Sheets.
[4] | Included in long-term debt in the Companies’ Consolidated Balance Sheets.

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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