v3.26.1
Related-Party Transactions (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Related Party Transaction [Line Items]        
Services provided to affiliates $ 4,480 $ 3,810 $ 9,499 $ 7,886
Virginia Electric and Power Company        
Related Party Transaction [Line Items]        
Commodity purchases from affiliates 134 147 813 513
Services provided to affiliates [1] 3,421 2,712 7,117 5,477
Virginia Electric and Power Company | Related Party        
Related Party Transaction [Line Items]        
Services provided by affiliates [2],[3] 230 196 479 405
Services provided to affiliates $ 5 $ 3 $ 9 $ 7
[1] See Note 18 for amounts attributable to affiliates.
[2] Excludes amounts related to Virginia Power's operating lease with an affiliated entity as discussed below.
[3] Includes capitalized expenditures of $87 million and $71 million for the three months ended June 30, 2026 and 2025, respectively, and $178 million and $146 million for the six months ended June 30, 2026 and 2025, respectively.