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Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Detail) | Sep. 30, 2020 USD ($)
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Guarantee Obligations [Line Items] |  |
Maximum Exposure | $ 5,717,000,000 | [1]
Financial Guarantee | Third Parties |  |
Guarantee Obligations [Line Items] |  |
Maximum Exposure | 10,000,000 |
Surety Bond |  |
Guarantee Obligations [Line Items] |  |
Maximum Exposure | 156,000,000 |
Surety Bond | Virginia Electric and Power Company |  |
Guarantee Obligations [Line Items] |  |
Maximum Exposure | 90,000,000 |
Financial Standby Letter of Credit |  |
Guarantee Obligations [Line Items] |  |
Maximum Exposure | $ 96,000,000 |
[1] | Excludes Dominion Energy's guarantees for the new corporate office properties discussed in Note 15 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2019 and in Note 14 in this report.

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