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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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