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Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Detail) $ in Millions | Dec. 31, 2020 USD ($)
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Bath Country Pumped Storage Station |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 60.00% | [1]
Plant in service | $ 1,064 | [1]
Accumulated depreciation | (688) | [1]
Plant under construction | $ 3 | [1]
North Anna |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 88.40% | [1]
Plant in service | $ 2,587 | [1]
Accumulated depreciation | (1,359) | [1]
Nuclear fuel | 793 | [1]
Accumulated amortization of nuclear fuel | (661) | [1]
Plant under construction | $ 158 | [1]
Clover Power Station |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 50.00% | [1]
Plant in service | $ 609 | [1]
Accumulated depreciation | (260) | [1]
Plant under construction | $ 1 | [1]
Millstone Unit |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 93.50% | [2]
Plant in service | $ 1,292 | [2]
Accumulated depreciation | (482) | [2]
Nuclear fuel | 573 | [2]
Accumulated amortization of nuclear fuel | (444) | [2]
Plant under construction | $ 78 | [2]
Summer Unit |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 66.70% | [2]
Plant in service | $ 1,519 | [2]
Accumulated depreciation | (676) | [2]
Nuclear fuel | 575 | [2]
Accumulated amortization of nuclear fuel | (354) | [2]
Plant under construction | $ 61 | [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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