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Long-Term Debt (Narrative) (Detail) - USD ($)
1 Months Ended 12 Months Ended
Oct. 01, 2024
Aug. 15, 2016
Aug. 31, 2019
Jul. 31, 2017
Jul. 31, 2016
Apr. 30, 2016
Oct. 31, 2014
Sep. 30, 2011
Sep. 30, 2006
Jun. 30, 2006
Dec. 31, 2018
May 31, 2017
Aug. 31, 2016
Jun. 29, 2016
May 31, 2016
Mar. 31, 2016
Jul. 31, 2014
Jun. 30, 2013
Debt Instrument [Line Items]                                    
Aggregate outstanding principal of senior notes                     $ 2,200,000,000              
Aggregate redemption price paid                     2,200,000,000              
Make-whole premium                     $ 34,000,000              
Period of deferral             10 years                      
Period for consideration of proceeds (days)               180 days     365 days              
Interest in RSN issued by Dominion (percentage)                     5.00%              
Common Stock                                    
Debt Instrument [Line Items]                                    
Purchase price to be paid under stock purchase contracts (in dollars per unit)                     $ 50              
Shares reserved and available for issuance                     23,100,000              
Capital Unit, Class A                                    
Debt Instrument [Line Items]                                    
Principal amount of notes                         $ 1,400,000,000          
Payment percentage rate on Equity Units                         6.75%       6.375% 6.125%
Purchase price to be paid under stock purchase contracts (in dollars per unit)                     $ 50              
Issuance of common stock (in shares)   28,000,000 [1]   12,500,000                            
Capital Unit, Class B                                    
Debt Instrument [Line Items]                                    
Payment percentage rate on Equity Units                                   6.00%
Scenario, Forecast | Maximum                                    
Debt Instrument [Line Items]                                    
Shares to be issued under purchase contracts     18,900,000                              
Scenario, Forecast | Minimum                                    
Debt Instrument [Line Items]                                    
Shares to be issued under purchase contracts     15,100,000                              
Senior Note Redemptions [Member]                                    
Debt Instrument [Line Items]                                    
Interest expense                     $ 69,000,000              
Senior Note Redemptions [Member] | Series A 4.45% Senior Notes Due 2021 [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate (percentage)                     4.45%              
Senior Note Redemptions [Member] | Series B 2.50% Senior Notes Due 2019 [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate (percentage)                     2.50%              
Senior Note Redemptions [Member] | Series C 3.625% Senior Notes Due 2024 [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate (percentage)                     3.625%              
June 2006 and September 2006 hybrids | Unsecured Junior Subordinated Notes | Maximum                                    
Debt Instrument [Line Items]                                    
Amount purchased and cancelled         $ 200,000,000                          
July 2016 Hybrids | Unsecured Junior Subordinated Notes                                    
Debt Instrument [Line Items]                                    
Interest rate (percentage)         5.25%                          
Principal amount of notes         $ 800,000,000                          
Remarketable Subordinated Notes | Capital Unit, Class A                                    
Debt Instrument [Line Items]                                    
Interest rate (percentage)   2.00% [1],[2]                   1.50%       1.07%    
Principal amount of notes   $ 1,400,000,000 [1]                   $ 1,000,000,000       $ 550,000,000 $ 1,000,000,000 $ 550,000,000
Issuance of common stock (in shares)       12,500,000 8,500,000 8,500,000                        
Remarketable Subordinated Notes | Capital Unit, Class B                                    
Debt Instrument [Line Items]                                    
Interest rate (percentage)                             1.18%      
Principal amount of notes                             $ 550,000,000     $ 550,000,000
Series A Junior Subordinated Notes | Unsecured Junior Subordinated Notes                                    
Debt Instrument [Line Items]                                    
Interest rate (percentage)                       2.579%       4.104%    
Series B Junior Subordinated Notes | Unsecured Junior Subordinated Notes                                    
Debt Instrument [Line Items]                                    
Interest rate (percentage)                             2.962%      
Remarketable Subordinated Notes, 2016 Series A-1, due August 15, 2021                                    
Debt Instrument [Line Items]                                    
Interest in RSN issued by Dominion (percentage)                     2.50%              
Remarketable Subordinated Notes, 2016 Series A-1, due August 15, 2021 | Capital Unit, Class A                                    
Debt Instrument [Line Items]                                    
Principal amount of notes   700,000,000                                
Remarketable Subordinated Notes, 2016 Series A-2, due August 15, 2024                                    
Debt Instrument [Line Items]                                    
Interest in RSN issued by Dominion (percentage)                     2.50%              
Remarketable Subordinated Notes, 2016 Series A-2, due August 15, 2024 | Capital Unit, Class A                                    
Debt Instrument [Line Items]                                    
Principal amount of notes   $ 700,000,000                                
June 2006 hybrids                                    
Debt Instrument [Line Items]                                    
Aggregate redemption price paid                               $ 38,000,000    
Interest rate (percentage)                           7.50%        
Junior subordinated notes                   $ 300,000,000                
June 2006 hybrids | Unsecured Junior Subordinated Notes                                    
Debt Instrument [Line Items]                                    
Amount purchased and cancelled         $ 125,000,000                          
June 2006 hybrids | LIBOR [Member]                                    
Debt Instrument [Line Items]                                    
Spread on variable percentage rate                   2.825%                
September 2006 hybrids                                    
Debt Instrument [Line Items]                                    
Aggregate redemption price paid                               $ 4,000,000    
Junior subordinated notes                 $ 500,000,000                  
September 2006 hybrids | Unsecured Junior Subordinated Notes                                    
Debt Instrument [Line Items]                                    
Amount purchased and cancelled         $ 74,000,000                          
September 2006 hybrids | LIBOR [Member]                                    
Debt Instrument [Line Items]                                    
Spread on variable percentage rate                 2.30%                  
October 2014 Hybrids [Member] | Unsecured Junior Subordinated Notes                                    
Debt Instrument [Line Items]                                    
Interest rate (percentage)             5.75%                      
Principal amount of notes             $ 685,000,000                      
October 2014 Hybrids [Member] | LIBOR [Member] | Unsecured Junior Subordinated Notes | Scenario, Forecast                                    
Debt Instrument [Line Items]                                    
Spread on variable percentage rate 3.057%                                  
[1] The maturity dates of the $700 million Series A-1 RSNs and $700 million Series A-2 RSNs are August 15, 2021 and August 15, 2024, respectively.
[2] Annual interest rate applies to each of the Series A-1 RSNs and Series A-2 RSNs.