XML 135 R122.htm IDEA: XBRL DOCUMENT v3.23.3
Operating Segments - Virginia Power (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]      
Gain (loss) on investments   $ 228 $ (658)
Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Gain (loss) on investments   31 (89)
Deferred amounts related to certain riders | Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Charge for the write-off of certain previously deferred amounts $ 36    
Charge for the write-off of certain previously deferred amounts, after tax $ 27    
Operating Segments      
Segment Reporting Information [Line Items]      
After- tax net benefits (expenses)   245 (1,900)
Operating Segments | Nuclear Decommissioning Trust Funds      
Segment Reporting Information [Line Items]      
Gain (loss) on investments   183 (691)
Gain (loss) on investments, after tax   142 (536)
Operating Segments | Corporate and Other      
Segment Reporting Information [Line Items]      
After- tax net benefits (expenses)   26 (1,000)
After- tax net benefits (expenses) for specific items   231 (1,000)
Operating Segments | Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
After- tax net benefits (expenses)   (154) (635)
Charge associated with storm damage and service restoration     94
Charge associated with storm damage and service restoration, after tax     70
Charge for amortization of a regulatory asset, 2021 Triennial Review   183 183
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax   136 136
Charge in connection with comprehensive settlement agreement for fuel expenses     191
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax     142
Charge for RGGI compliance cost     213
Charge for RGGI compliance cost, after tax     159
Charges for Dismantling cost     60
Charges for Dismantling cost, after tax     45
Operating Segments | Virginia Electric and Power Company | Nuclear Decommissioning Trust Funds      
Segment Reporting Information [Line Items]      
Gain (loss) on investments   24 (96)
Gain (loss) on investments, after tax   18 (71)
Operating Segments | Virginia Electric and Power Company | Corporate and Other      
Segment Reporting Information [Line Items]      
After- tax net benefits (expenses)   (150) (601)
After- tax net benefits (expenses) for specific items   (156) $ (641)
Operating Segments | Deferred amounts related to certain riders | Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Charge for the write-off of certain previously deferred amounts   36  
Charge for the write-off of certain previously deferred amounts, after tax   $ 27