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Employee Benefit Plans (Net Periodic Benefit Cost (Credit)) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 35 $ 42 $ 71 $ 84
Interest cost 84 79 167 158
Expected return on plan assets (223) (208) (446) (416)
Amortization of net actuarial loss 40 49 80 97
Settlements [1]   7   5
Net periodic benefit (credit) cost (64) (31) (128) (72)
Other Postretirement Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5 6 11 12
Interest cost 12 12 23 24
Expected return on plan assets (48) (43) (96) (87)
Amortization of prior service cost (credit) (9) (11) (19) (21)
Amortization of net actuarial loss (1) 1 (1) 2
Net periodic benefit (credit) cost $ (41) $ (35) $ (82) $ (70)
[1] 2021 amounts relate primarily to the Dominion Energy executive nonqualified pension plan