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Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Detail) $ in Millions | Dec. 31, 2023 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 | $ 1,066 | [1]
Accumulated depreciation | (766) | [1]
Plant under construction | $ 9 | [1]
North Anna |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 88.40% | [1]
Plant in service | $ 2,632 | [1]
Accumulated depreciation | (1,455) | [1]
Nuclear fuel | 787 | [1]
Accumulated amortization of nuclear fuel | (619) | [1]
Plant under construction | $ 337 | [1]
Clover Power Station |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 50.00% | [1]
Plant in service | $ 612 | [1]
Accumulated depreciation | (302) | [1]
Plant under construction | $ 2 | [1]
Millstone Unit |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 93.50% | [2]
Plant in service | $ 1,513 | [2]
Accumulated depreciation | (604) | [2]
Nuclear fuel | 540 | [2]
Accumulated amortization of nuclear fuel | (412) | [2]
Plant under construction | $ 81 | [2]
Summer Unit |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 66.70% | [2]
Plant in service | $ 1,557 | [2]
Accumulated depreciation | (744) | [2]
Nuclear fuel | 609 | [2]
Accumulated amortization of nuclear fuel | (380) | [2]
Plant under construction | $ 87 | [2]
[1] | Units jointly owned by Virginia Power.
[2] | Units 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 -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + 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 -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + 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 -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + 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 -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
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