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Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | --- | ---
Lessee Lease Disclosure [Line Items] |  |  |  |  |  |
Operating lease assets |  | $ 564 | [1] | $ 462 | [1] | $ 504
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  | d:DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent |  | d:DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent |  |
Finance lease assets | [2] | $ 148 |  | $ 134 |  |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  | us-gaap:PropertyPlantAndEquipmentNet |  | us-gaap:PropertyPlantAndEquipmentNet |  |
Total lease assets |  | $ 712 |  | $ 596 |  |
Operating lease liabilities | [3] | $ 54 |  | $ 53 |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] |  | us-gaap:OtherLiabilitiesCurrent |  | us-gaap:OtherLiabilitiesCurrent |  |
Finance lease liabilities | [4] | $ 32 |  | $ 27 |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] |  | us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent |  | us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent |  |
Total lease liabilities - current |  | $ 86 |  | $ 80 |  |
Operating lease liabilities | [5] | $ 516 |  | $ 413 |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] |  | us-gaap:DeferredCreditsAndOtherLiabilities |  | us-gaap:DeferredCreditsAndOtherLiabilities |  |
Finance lease liabilities | [6] | $ 108 |  | $ 100 |  |
Total lease liabilities - noncurrent |  | 624 |  | 513 |  |
Total lease liabilities |  | 710 |  | 593 |  |
Virginia Electric and Power Company |  |  |  |  |  |
Lessee Lease Disclosure [Line Items] |  |  |  |  |  |
Operating lease assets |  | $ 185 | [1] | $ 212 | [1] | $ 209
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  | d:DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent |  | d:DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent |  |
Finance lease assets | [2] | $ 45 |  | $ 19 |  |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  | us-gaap:PropertyPlantAndEquipmentNet |  | us-gaap:PropertyPlantAndEquipmentNet |  |
Total lease assets |  | $ 230 |  | $ 231 |  |
Operating lease liabilities | [3] | $ 28 |  | $ 30 |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] |  | us-gaap:OtherLiabilitiesCurrent |  | us-gaap:OtherLiabilitiesCurrent |  |
Finance lease liabilities | [4] | $ 8 |  | $ 3 |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] |  | us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent |  | us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent |  |
Total lease liabilities - current |  | $ 36 |  | $ 33 |  |
Operating lease liabilities | [5] | $ 155 |  | $ 180 |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] |  | us-gaap:DeferredCreditsAndOtherLiabilities |  | us-gaap:DeferredCreditsAndOtherLiabilities |  |
Finance lease liabilities | [6] | $ 36 |  | $ 16 |  |
Total lease liabilities - noncurrent |  | 191 |  | 196 |  |
Total lease liabilities |  | $ 227 |  | $ 229 |  |
[1] | Included in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets.
[2] | Included in property, plant and equipment in the Companies’ Consolidated Balance Sheets, net of $50 million and $9 million of accumulated amortization at Dominion Energy and Virginia Power, respectively, at December 31, 2020 and net of $26 million and $4 million of accumulated amortization at Dominion Energy and Virginia Power, respectively, at December 31, 2019.
[3] | Included in other current liabilities in the Companies’ Consolidated Balance Sheets.
[4] | Included in securities due within one year in the Companies’ Consolidated Balance Sheets.
[5] | Included in other deferred credits and other liabilities in the Companies’ Consolidated Balance Sheets.
[6] | Included in other long-term debt in the Companies’ Consolidated Balance Sheets.

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