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Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Jan. 01, 2019
--- | --- | ---
Lessee Lease Disclosure [Line Items] |  |  |
Finance lease assets, accumulated amortization | $ 39 |  |
Lease Right Of Use Assets | 455 |  | $ 504
Lease Liabilities | 452 |  | 504
Discontinued Operations [Member] |  |  |
Lessee Lease Disclosure [Line Items] |  |  |
Lease Right Of Use Assets | 26 |  |
Lease Liabilities | 24 |  |
Virginia Electric and Power Company |  |  |
Lessee Lease Disclosure [Line Items] |  |  |
Finance lease assets, accumulated amortization | 3 |  |
Lease Right Of Use Assets | 184 |  | 209
Lease Liabilities | 182 |  | 209
Dominion Energy Gas Holdings, LLC |  |  |
Lessee Lease Disclosure [Line Items] |  |  |
Finance lease assets, accumulated amortization | 1 |  |
Lease Right Of Use Assets | 37 |  | 64
Lease Liabilities | $ 56 | [1] | $ 64
[1] | Includes amounts reflected in discontinued operations.

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- Definition Finance lease right of use asset accumulated amortization. + References No definition available. + Details
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- Definition Lessee, lease, disclosure. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + 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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- Definition Amount of lessee's right to use underlying asset under operating lease. + 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 (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Details
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- Details
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- Details
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