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Short-Term Debt and Credit Agreements (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Detail) - USD ($) | Dec. 31, 2020 | [1] | Dec. 31, 2019
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Line Of Credit Facility [Line Items] |  |  |
Facility Limit | [2] | $ 6,000,000,000 | $ 6,000,000,000
Outstanding Commercial Paper | [2],[3] | 627,000,000 | 836,000,000
Outstanding Letters of Credit | [2] | 100,000,000 | 89,000,000
Facility Capacity Available | [2] | 5,273,000,000 | 5,075,000,000
Virginia Electric and Power Company |  |  |
Line Of Credit Facility [Line Items] |  |  |
Facility Limit | [4] | 6,000,000,000 | 6,000,000,000
Outstanding Commercial Paper | [4],[5] | 45,000,000 | 243,000,000
Outstanding Letters of Credit | [4] | $ 12,000,000 | $ 7,000,000
[1] | In October 2020, the joint revolving credit facility was amended to remove Dominion Energy Gas as a co-borrower.
[2] | This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[3] | The weighted-average interest rates of the outstanding commercial paper supported by Dominion Energy’s credit facility was 0.29% and 2.10% at December 31, 2020 and 2019, respectively.
[4] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Questar Gas and DESC. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At December 31, 2020, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[5] | The weighted-average interest rates of the outstanding commercial paper supported by the credit facility was 0.30% and 2.10% at December 31, 2020 and 2019, respectively.

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date of the current portion of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer). + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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