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Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Detail) $ in Millions | Dec. 31, 2018 USD ($)
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Millstone Unit |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 93.50% | [1]
Plant in service | $ 1,231 | [1]
Accumulated depreciation | (400) | [1]
Nuclear fuel | 571 | [1]
Accumulated amortization of nuclear fuel | (423) | [1]
Plant under construction | $ 66 | [1]
Virginia Electric and Power Company | Bath Country Pumped Storage Station |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 60.00% | [2]
Plant in service | $ 1,058 | [2]
Accumulated depreciation | (639) | [2]
Plant under construction | $ 6 | [2]
Virginia Electric and Power Company | North Anna |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 88.40% | [2]
Plant in service | $ 2,560 | [2]
Accumulated depreciation | (1,305) | [2]
Nuclear fuel | 721 | [2]
Accumulated amortization of nuclear fuel | (608) | [2]
Plant under construction | $ 103 | [2]
Virginia Electric and Power Company | Clover Power Station |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 50.00% | [2]
Plant in service | $ 590 | [2]
Accumulated depreciation | (240) | [2]
Plant under construction | $ 9 | [2]
[1] | Unit jointly owned by Dominion Energy.
[2] | Units jointly owned by Virginia Power.

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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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