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Asset Retirement Obligations (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Asset Retirement Obligations [Line Items] |  |  |
Nuclear decommissioning trust funds | $ 6,192 |  | $ 4,938
Asset Retirement Obligation, Liabilities Incurred | 2,413 | [1] | 20
Virginia Electric and Power Company |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Nuclear decommissioning trust funds | 2,881 |  | 2,369
Asset Retirement Obligation, Liabilities Incurred | 2,408 | [1] | 14
D Virginia Electric And Power Company [Member] |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Asset Retirement Obligation, Liabilities Incurred | 1,700 |  | 1,600
D Virginia Electric And Power Company [Member] | Future Decommissioning Of Nuclear Facilities [Member] |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Asset Retirement Obligation, Liabilities Incurred | 800 |  | $ 900
D Virginia Electric And Power Company [Member] | D Cost Of Landfills And Beneficial Reuse [Member] |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Asset Retirement Obligation, Liabilities Incurred | $ 2,600 |  |
[1] | Reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 23 for further information.

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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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