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Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Detail) $ in Millions | Dec. 31, 2022 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 | (730) | [1]
Plant under construction | $ 3 | [1]
North Anna |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 88.40% | [1]
Plant in service | $ 2,540 | [1]
Accumulated depreciation | (1,402) | [1]
Nuclear fuel | 792 | [1]
Accumulated amortization of nuclear fuel | (602) | [1]
Plant under construction | $ 253 | [1]
Clover Power Station |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 50.00% | [1]
Plant in service | $ 611 | [1]
Accumulated depreciation | $ (282) | [1]
Millstone Unit |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 93.50% | [2]
Plant in service | $ 1,487 | [2]
Accumulated depreciation | (563) | [2]
Nuclear fuel | 551 | [2]
Accumulated amortization of nuclear fuel | (459) | [2]
Plant under construction | $ 68 | [2]
Summer Unit |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest | 66.70% | [2]
Plant in service | $ 1,532 | [2]
Accumulated depreciation | (724) | [2]
Nuclear fuel | 550 | [2]
Accumulated amortization of nuclear fuel | (347) | [2]
Plant under construction | $ 87 | [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 -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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