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Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Detail) $ in Millions | Dec. 31, 2019 USD ($)
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Virginia Electric and Power Company | Bath Country Pumped Storage Station |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 60.00% | [1]
Plant in service | $ 1,058 | [1]
Accumulated depreciation | (661) | [1]
Plant under construction | $ 7 | [1]
Virginia Electric and Power Company | North Anna |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 88.40% | [1]
Plant in service | $ 2,564 | [1]
Accumulated depreciation | (1,321) | [1]
Nuclear fuel | 793 | [1]
Accumulated amortization of nuclear fuel | (634) | [1]
Plant under construction | $ 143 | [1]
Virginia Electric and Power Company | Clover Power Station |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 50.00% | [1]
Plant in service | $ 610 | [1]
Accumulated depreciation | (247) | [1]
Plant under construction | $ 5 | [1]
Dominion Energy | Millstone Unit |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 93.50% | [2]
Plant in service | $ 1,267 | [2]
Accumulated depreciation | (449) | [2]
Nuclear fuel | 483 | [2]
Accumulated amortization of nuclear fuel | (390) | [2]
Plant under construction | $ 87 | [2]
Dominion Energy | Summer Unit |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 66.70% | [2]
Plant in service | $ 1,394 | [2]
Accumulated depreciation | (659) | [2]
Nuclear fuel | 608 | [2]
Accumulated amortization of nuclear fuel | (389) | [2]
Plant under construction | $ 77 | [2]
[1] | Units jointly owned by Virginia Power.
[2] | Unit jointly owned by Dominion Energy.

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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
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