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Long-Term Debt (Narrative) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |  |  |

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