Variable Interest Entities (Narrative) (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
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Variable Interest Entity [Line Items] | ||||||||||||||||
Payable to affiliates | [1],[2] | $ 1,754 | $ 1,754 | $ 2,084 | [3] | |||||||||||
Virginia Electric and Power Company | ||||||||||||||||
Variable Interest Entity [Line Items] | ||||||||||||||||
Payable to affiliates | [4] | 1,337 | 1,337 | $ 1,549 | [5] | |||||||||||
Virginia Electric and Power Company | CVOW Commercial Project | ||||||||||||||||
Variable Interest Entity [Line Items] | ||||||||||||||||
Equity Method Investment, Ownership Percentage | 50.00% | |||||||||||||||
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES | ||||||||||||||||
Variable Interest Entity [Line Items] | ||||||||||||||||
Shared Services Purchased | 142 | $ 128 | 297 | $ 243 | ||||||||||||
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party | ||||||||||||||||
Variable Interest Entity [Line Items] | ||||||||||||||||
Payable to affiliates | 42 | 42 | $ 38 | |||||||||||||
Variable Interest Entity Not Primary Beneficiary | OSWP [Member] | ||||||||||||||||
Variable Interest Entity [Line Items] | ||||||||||||||||
Payable to affiliates | $ 8 | $ 8 | $ 0 | |||||||||||||
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