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Nominal or face amount used to calculate payments on the derivative liability.

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Long-Term Debt (Narrative) (Detail) - USD ($) shares in Millions		1 Months Ended								12 Months Ended
	Oct. 01, 2024	Feb. 25, 2021	Sep. 30, 2020	Aug. 31, 2020	Jun. 30, 2020	Feb. 29, 2020	Aug. 31, 2019	Sep. 30, 2006	Jun. 30, 2006	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Jun. 30, 2019	Jul. 31, 2016	Oct. 31, 2014
Debt Instrument [Line Items]
Repayment of Debt										$ 2,879,000,000	$ 9,116,000,000	$ 5,682,000,000
Period of deferral										10 years
Issuance of common stock (in shares)			4.1				18.5				6.1
Other long-term debt										$ 881,000,000	$ 100,000,000
Interest Rate Swap
Debt Instrument [Line Items]
Derivative notional value					$ 2,000,000,000.0
Derivative maturity month and year					2024-12
Other long-term debt					$ 326,000,000
Derivative imputed interest rate					1.19%
Interest Rate Swap \| Virginia Power
Debt Instrument [Line Items]
Derivative notional value				$ 900,000,000
Derivative maturity month and year				2023-12
Other long-term debt				$ 443,000,000
Derivative imputed interest rate				0.34%
June2006 Hybrids
Debt Instrument [Line Items]
Debt, amount redeemed											12,000,000
Junior subordinated notes									$ 300,000,000
Repayment of Debt						$ 111,000,000
June2006 Hybrids \| LIBOR
Debt Instrument [Line Items]
Spread on variable percentage rate									2.825%
September 2006 Hybrids
Debt Instrument [Line Items]
Principal amount of notes											$ 13,000,000
Junior subordinated notes								$ 500,000,000
Repayment of Debt						$ 286,000,000
September 2006 Hybrids \| LIBOR
Debt Instrument [Line Items]
Spread on variable percentage rate								2.30%
June 2006 and September 2006 Hybrids
Debt Instrument [Line Items]
Debt instrument, maturity date, description										both of which would have otherwise matured in 2066
October 2014 Hybrids \| Unsecured Junior Subordinated Notes
Debt Instrument [Line Items]
Principal amount of notes																$ 685,000,000
Interest rate (percentage)																5.75%
SCANA
Debt Instrument [Line Items]
Debt instrument, maturity date, description										In March 2020, SCANA redeemed the remaining principal outstanding of $183 million of its 4.75% medium-term notes and $155 million of its 4.125% medium-term notes plus accrued interest and make-whole premiums. The notes would have otherwise matured in May 2021 and February 2022, respectively.
Interest and Related Charges \| June 2006 and September 2006 Hybrids
Debt Instrument [Line Items]
Expenses related to early redemption of hybrids										$ 10,000,000
Floating rate senior notes \| SCANA
Debt Instrument [Line Items]
Debt, amount redeemed													$ 66,000,000
Debt instrument, maturity date, description										In March 2020, SCANA redeemed its floating rate senior notes at the remaining principal balance of $66 million plus accrued interest. The notes would have otherwise matured in June 2034.
Floating rate senior notes \| Interest and Related Charges \| SCANA
Debt Instrument [Line Items]
Expenses related to early redemption of hybrids										$ 7,000,000
Four Point Seven Five Percent Medium Term Notes \| SCANA
Debt Instrument [Line Items]
Interest rate (percentage)													4.75%
Debt, amount redeemed													$ 183,000,000
Four Point One Two Five Percent Medium Term Notes \| SCANA
Debt Instrument [Line Items]
Interest rate (percentage)													4.125%
Debt, amount redeemed													$ 155,000,000
4.75% and 4.125% Medium Term Notes \| Interest and Related Charges \| SCANA
Debt Instrument [Line Items]
Expenses related to early redemption of hybrids										$ 14,000,000
July 2016 Hybrids \| Unsecured Junior Subordinated Notes
Debt Instrument [Line Items]
Principal amount of notes															$ 800,000,000
Interest rate (percentage)															5.25%
July 2016 Hybrids \| October 2014 Hybrids \| Scenario, Forecast
Debt Instrument [Line Items]
Spread on variable percentage rate	3.057%
Remarketable Subordinated Notes, 2016 Series A-1, due August 15, 2021
Debt Instrument [Line Items]
Interest rate (percentage)										2.00%
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 rate (percentage)										2.00%
Remarketable Subordinated Notes, 2016 Series A-2, due August 15, 2024 \| Capital Unit, Class B
Debt Instrument [Line Items]
Principal amount of notes														$ 700,000,000
Series A Junior Subordinated Notes \| Capital Unit, Class B
Debt Instrument [Line Items]
Interest rate (percentage)														2.715%
Remarketable Subordinated Notes \| Capital Unit, Class B
Debt Instrument [Line Items]
Interest rate (percentage)														3.071%
Issuance of common stock (in shares)							18.5
Private Placement \| 3.10% Senior Notes \| Subsequent Event
Debt Instrument [Line Items]
Principal amount of notes		$ 150,000,000
Interest rate (percentage)		3.10%
Debt instrument term		30 years