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Derivatives - Schedule of Derivative Category and Balance Sheet Location (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | $ 142 | $ 89
Gross amounts offset | (54) | (44)
Derivative asset, net amounts recognized in the balance sheets | 88 | 45
Derivative liability, gross amount recognized | 301 | 615
Gross amounts offset | (63) | (61)
Derivative liability, net amounts recognized in the balance sheets | 238 | 554
Collateral already posted, assets, aggregate fair value | 10 |
Interest rate derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, net amounts recognized in the balance sheets | 20 |
Energy-related derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 13 | 6
Derivative liability, gross amount recognized | 7 | 3
Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Assets from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 13 | 5
Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Liabilities from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 7 | 3
Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 0 | 1
Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 0 | 0
Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 85 | 75
Derivative liability, gross amount recognized | 76 | 122
Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Assets from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 34 | 33
Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Liabilities from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 44 | 82
Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 51 | 42
Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 32 | 40
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 44 | 8
Derivative liability, gross amount recognized | 218 | 490
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Assets from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 2 | 4
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Liabilities from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 6 | 3
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 4 | 4
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 0 | 0
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Assets from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 7 | 0
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Liabilities from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 53 | 61
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 0 | 0
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 138 | 208
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Assets from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 20 | 0
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Liabilities from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 21 | 36
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 11 | 0
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 0 | 182
ALABAMA POWER CO |  |
Derivatives, Fair Value [Line Items] |  |
Gross amounts offset | (17) | (19)
Derivative asset, net amounts recognized in the balance sheets | 14 | 7
Gross amounts offset | (17) | (19)
Derivative liability, net amounts recognized in the balance sheets | 8 | 23
Collateral already posted, assets, aggregate fair value | 0 |
ALABAMA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 31 | 26
Derivative liability, gross amount recognized | 25 | 42
ALABAMA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 13 | 11
ALABAMA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 13 | 30
ALABAMA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 18 | 15
ALABAMA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 12 | 12
GEORGIA POWER CO |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 27 | 19
Gross amounts offset | (16) | (15)
Derivative asset, net amounts recognized in the balance sheets | 11 | 4
Derivative liability, gross amount recognized | 24 | 42
Gross amounts offset | (16) | (15)
Derivative liability, net amounts recognized in the balance sheets | 8 | 27
GEORGIA POWER CO | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 2 | 0
GEORGIA POWER CO | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 0 | 1
GEORGIA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 25 | 19
Derivative liability, gross amount recognized | 24 | 41
GEORGIA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Assets from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 8 | 6
GEORGIA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 15 | 32
GEORGIA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 17 | 13
GEORGIA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 9 | 9
MISSISSIPPI POWER CO |  |
Derivatives, Fair Value [Line Items] |  |
Gross amounts offset | (15) | (17)
Derivative asset, net amounts recognized in the balance sheets | 5 | 2
Gross amounts offset | (15) | (17)
Derivative liability, net amounts recognized in the balance sheets | 8 | 17
MISSISSIPPI POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 20 | 19
Derivative liability, gross amount recognized | 23 | 34
MISSISSIPPI POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Assets from risk management activities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 4 | 5
MISSISSIPPI POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 12 | 15
MISSISSIPPI POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 16 | 14
MISSISSIPPI POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 11 | 19
SOUTHERN POWER CO |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, net amounts recognized in the balance sheets | 24 | 4
Derivative liability, net amounts recognized in the balance sheets | 1 | 51
Collateral already posted, assets, aggregate fair value | 0 |
SOUTHERN POWER CO | Energy-related derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, net amounts recognized in the balance sheets | 0 |
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 24 | 4
Derivative liability, gross amount recognized | 1 | 51
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 1 | 1
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 1 | 0
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 3 | 3
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 0 | 0
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 20 | 0
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 0 | 11
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 0 | 0
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 0 | 40
SOUTHERN Co GAS |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 22 | 21
Gross amounts offset | (6) | 7
Derivative asset, net amounts recognized in the balance sheets | 16 | 28
Derivative liability, gross amount recognized | 72 | 94
Gross amounts offset | (15) | (10)
Derivative liability, net amounts recognized in the balance sheets | 57 | 84
Collateral already posted, assets, aggregate fair value | 10 | 17
SOUTHERN Co GAS | Energy-related derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 11 | 6
Derivative liability, gross amount recognized | 7 | 2
SOUTHERN Co GAS | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 11 | 5
SOUTHERN Co GAS | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 7 | 2
SOUTHERN Co GAS | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 0 | 1
SOUTHERN Co GAS | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 0 | 0
SOUTHERN Co GAS | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 9 | 11
SOUTHERN Co GAS | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 4 | 5
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 2 | 4
Derivative liability, gross amount recognized | 61 | 87
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 1 | 3
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 5 | 3
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 1 | 1
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 0 | 0
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 0 | 0
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 13 | 17
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other deferred charges and assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amount recognized | 0 | 0
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other deferred credits and liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | $ 43 | $ 67

X
- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 185 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-185 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4H -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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X
- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5C -Subparagraph (SX 210.12-13C(Column F)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5C Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5B -Subparagraph (SX 210.12-13B(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5B + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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