Debt instrument maturity year.

No definition available.

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- Definition

Defer interest payments on the hybrids.

+ References

No definition available.

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- Definition

Derivative imputed interest rate.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Derivative maturity month and year.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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- Definition

Amount of long-term debt classified as other, payable after one year or the operating cycle, if longer.

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- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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Long-Term Debt (Narrative) (Detail) - USD ($)	1 Months Ended			12 Months Ended
Long-Term Debt (Narrative) (Detail) - USD ($)	Aug. 31, 2021	Aug. 31, 2020	Jun. 30, 2020	Dec. 31, 2022	Aug. 31, 2022	Dec. 31, 2021	Jul. 31, 2016	Oct. 31, 2014
Debt Instrument [Line Items]
Debt, amount redeemed	$ 39,000,000			$ 263,000,000	$ 154,000,000
Period of deferral				10 days
Other long-term debt				$ 245,000,000		$ 850,000,000
Interest Rate Swap
Debt Instrument [Line Items]
Derivative notional value			$ 2,000,000,000.0
Derivative maturity month and year			2024-12
Other long-term debt			$ 326,000,000
Derivative imputed interest rate			1.19%
Interest Rate Swap \| Virginia Power
Debt Instrument [Line Items]
Derivative notional value		$ 900,000,000
Derivative maturity month and year		2023-12
Other long-term debt		$ 443,000,000
Derivative imputed interest rate		0.34%
Junior Subordinated Debt
Debt Instrument [Line Items]
Interest rate percentage							5.25%
Debt instrument, face amount							$ 800,000,000
October 2014 Hybrids \| Junior Subordinated Debt
Debt Instrument [Line Items]
Junior subordinated notes								$ 685,000,000
Interest rate percentage								5.75%
July2016 Hybrids \| Junior Subordinated Debt
Debt Instrument [Line Items]
Debt, amount redeemed	800,000,000
Expenses related to early redemption of hybrids	$ 23,000,000
Debt instrument maturity year	2076