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Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Details) $ in Millions | Dec. 31, 2016 USD ($)
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Millstone Unit 3 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest (percentage) | 93.50% | [1]
Plant in service | $ 1,190 | [1]
Accumulated depreciation | (349) | [1]
Nuclear fuel | 469 | [1]
Accumulated amortization of nuclear fuel | (366) | [1]
Plant under construction | $ 51 | [1]
Virginia Electric and Power Company | Bath County Pumped Storage Station |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest (percentage) | 60.00% | [2]
Plant in service | $ 1,052 | [2]
Accumulated depreciation | (585) | [2]
Nuclear fuel | 0 | [2]
Accumulated amortization of nuclear fuel | 0 | [2]
Plant under construction | $ 8 | [2]
Virginia Electric and Power Company | North Anna |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest (percentage) | 88.40% | [2]
Plant in service | $ 2,520 | [2]
Accumulated depreciation | (1,210) | [2]
Nuclear fuel | 718 | [2]
Accumulated amortization of nuclear fuel | (549) | [2]
Plant under construction | $ 69 | [2]
Virginia Electric and Power Company | Clover Power Station |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Ownership interest (percentage) | 50.00% | [2]
Plant in service | $ 586 | [2]
Accumulated depreciation | (219) | [2]
Nuclear fuel | 0 | [2]
Accumulated amortization of nuclear fuel | 0 | [2]
Plant under construction | $ 4 | [2]
[1] | Unit jointly owned by Dominion.
[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://www.xbrl.org/2003/role/presentationRef -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=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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