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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Derivatives | $ 88 | $ 45
Liabilities: |  |
Derivatives | 238 | 554
Other | 24 |
Collateral already posted, assets, aggregate fair value | 10 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Liabilities: |  |
Other | 0 |
Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Other | 13 |
Significant Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Other | 11 |
ALABAMA POWER CO |  |
Assets: |  |
Derivatives | 14 | 7
Liabilities: |  |
Derivatives | 8 | 23
Collateral already posted, assets, aggregate fair value | 0 |
GEORGIA POWER CO |  |
Assets: |  |
Derivatives | 11 | 4
Liabilities: |  |
Derivatives | 8 | 27
MISSISSIPPI POWER CO |  |
Assets: |  |
Derivatives | 5 | 2
Liabilities: |  |
Derivatives | 8 | 17
SOUTHERN POWER CO |  |
Assets: |  |
Derivatives | 24 | 4
Liabilities: |  |
Derivatives | 1 | 51
Other | 24 |
Collateral already posted, assets, aggregate fair value | 0 |
SOUTHERN POWER CO | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Liabilities: |  |
Other | 0 |
SOUTHERN POWER CO | Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Other | 13 |
SOUTHERN POWER CO | Significant Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Other | 11 |
SOUTHERN Co GAS |  |
Assets: |  |
Derivatives | 16 | 28
Liabilities: |  |
Derivatives | 57 | 84
Collateral already posted, assets, aggregate fair value | 10 | $ 17
Fair Value, Measurements, Recurring |  |
Assets: |  |
Cash equivalents and restricted cash | 2,564 |
Other investments | 54 |
Total | 5,682 |
Liabilities: |  |
Contingent consideration | 17 |
Total | 342 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents and restricted cash | 2,547 |
Other investments | 10 |
Total | 3,724 |
Liabilities: |  |
Contingent consideration | 3 |
Total | 15 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents and restricted cash | 17 |
Other investments | 36 |
Total | 1,755 |
Liabilities: |  |
Contingent consideration | 0 |
Total | 302 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents and restricted cash | 0 |
Other investments | 8 |
Total | 8 |
Liabilities: |  |
Contingent consideration | 14 |
Total | 25 |
Fair Value, Measurements, Recurring | Net Asset Value as a Practical Expedient (NAV) |  |
Assets: |  |
Total | 195 |
Fair Value, Measurements, Recurring | Energy-related derivatives |  |
Assets: |  |
Derivatives | 104 |
Liabilities: |  |
Derivatives | 89 |
Fair Value, Measurements, Recurring | Energy-related derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivatives | 15 |
Liabilities: |  |
Derivatives | 12 |
Fair Value, Measurements, Recurring | Energy-related derivatives | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivatives | 89 |
Liabilities: |  |
Derivatives | 77 |
Fair Value, Measurements, Recurring | Energy-related derivatives | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | Interest rate derivatives |  |
Assets: |  |
Derivatives | 7 |
Liabilities: |  |
Derivatives | 191 |
Fair Value, Measurements, Recurring | Interest rate derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | Interest rate derivatives | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivatives | 7 |
Liabilities: |  |
Derivatives | 191 |
Fair Value, Measurements, Recurring | Interest rate derivatives | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | Domestic equity |  |
Assets: |  |
Investments in trusts | 1,222 |
Fair Value, Measurements, Recurring | Domestic equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 934 |
Fair Value, Measurements, Recurring | Domestic equity | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 288 |
Fair Value, Measurements, Recurring | Domestic equity | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Foreign equity |  |
Assets: |  |
Investments in trusts | 390 |
Fair Value, Measurements, Recurring | Foreign equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 174 |
Fair Value, Measurements, Recurring | Foreign equity | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 216 |
Fair Value, Measurements, Recurring | Foreign equity | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | U.S. Treasury and government agency securities |  |
Assets: |  |
Investments in trusts | 367 |
Investments, available-for-sale: | 13 |
Fair Value, Measurements, Recurring | U.S. Treasury and government agency securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Investments, available-for-sale: | 3 |
Fair Value, Measurements, Recurring | U.S. Treasury and government agency securities | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 367 |
Investments, available-for-sale: | 10 |
Fair Value, Measurements, Recurring | U.S. Treasury and government agency securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Investments, available-for-sale: | 0 |
Fair Value, Measurements, Recurring | U.S. Treasury and government agency securities | Net Asset Value as a Practical Expedient (NAV) |  |
Assets: |  |
Investments, available-for-sale: | 0 |
Fair Value, Measurements, Recurring | Municipal bonds |  |
Assets: |  |
Investments in trusts | 50 |
Fair Value, Measurements, Recurring | Municipal bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Municipal bonds | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 50 |
Fair Value, Measurements, Recurring | Municipal bonds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Pooled funds – fixed income |  |
Assets: |  |
Investments in trusts | 6 |
Fair Value, Measurements, Recurring | Pooled funds – fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Pooled funds – fixed income | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 6 |
Fair Value, Measurements, Recurring | Pooled funds – fixed income | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Corporate bonds |  |
Assets: |  |
Investments in trusts | 505 |
Investments, available-for-sale: | 2 |
Fair Value, Measurements, Recurring | Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Investments, available-for-sale: | 0 |
Fair Value, Measurements, Recurring | Corporate bonds | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 505 |
Investments, available-for-sale: | 2 |
Fair Value, Measurements, Recurring | Corporate bonds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Investments, available-for-sale: | 0 |
Fair Value, Measurements, Recurring | Corporate bonds | Net Asset Value as a Practical Expedient (NAV) |  |
Assets: |  |
Investments, available-for-sale: | 0 |
Fair Value, Measurements, Recurring | Mortgage- and asset-backed securities |  |
Assets: |  |
Investments in trusts | 120 |
Investments, available-for-sale: | 7 |
Fair Value, Measurements, Recurring | Mortgage- and asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Investments, available-for-sale: | 0 |
Fair Value, Measurements, Recurring | Mortgage- and asset-backed securities | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 120 |
Investments, available-for-sale: | 7 |
Fair Value, Measurements, Recurring | Mortgage- and asset-backed securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Investments, available-for-sale: | 0 |
Fair Value, Measurements, Recurring | Mortgage- and asset-backed securities | Net Asset Value as a Practical Expedient (NAV) |  |
Assets: |  |
Investments, available-for-sale: | 0 |
Fair Value, Measurements, Recurring | Private equity |  |
Assets: |  |
Investments in trusts | 186 |
Fair Value, Measurements, Recurring | Private equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Private equity | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Private equity | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Private equity | Net Asset Value as a Practical Expedient (NAV) |  |
Assets: |  |
Investments in trusts | 186 |
Fair Value, Measurements, Recurring | Cash and cash equivalents |  |
Assets: |  |
Investments in trusts | 1 |
Fair Value, Measurements, Recurring | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 1 |
Fair Value, Measurements, Recurring | Cash and cash equivalents | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Cash and cash equivalents | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Other |  |
Assets: |  |
Investments in trusts | 53 |
Fair Value, Measurements, Recurring | Other | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 40 |
Fair Value, Measurements, Recurring | Other | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 4 |
Fair Value, Measurements, Recurring | Other | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | Other | Net Asset Value as a Practical Expedient (NAV) |  |
Assets: |  |
Investments in trusts | 9 |
Fair Value, Measurements, Recurring | Foreign currency derivatives |  |
Assets: |  |
Derivatives | 31 |
Liabilities: |  |
Derivatives | 21 |
Fair Value, Measurements, Recurring | Foreign currency derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | Foreign currency derivatives | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivatives | 31 |
Liabilities: |  |
Derivatives | 21 |
Fair Value, Measurements, Recurring | Foreign currency derivatives | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO |  |
Assets: |  |
Cash equivalents and restricted cash | 281 |
Other investments | 36 |
Total | 1,872 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents and restricted cash | 264 |
Other investments | 0 |
Total | 956 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents and restricted cash | 17 |
Other investments | 36 |
Total | 721 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents and restricted cash | 0 |
Other investments | 0 |
Total | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Net Asset Value as a Practical Expedient (NAV) |  |
Assets: |  |
Total | 195 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Energy-related derivatives |  |
Assets: |  |
Derivatives | 31 |
Liabilities: |  |
Derivatives | 25 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Energy-related derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Energy-related derivatives | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivatives | 31 |
Liabilities: |  |
Derivatives | 25 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Energy-related derivatives | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Domestic equity |  |
Assets: |  |
Investments in trusts | 777 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Domestic equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 499 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Domestic equity | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 278 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Domestic equity | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Foreign equity |  |
Assets: |  |
Investments in trusts | 174 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Foreign equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 174 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Foreign equity | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Foreign equity | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | U.S. Treasury and government agency securities |  |
Assets: |  |
Investments in trusts | 16 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | U.S. Treasury and government agency securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | U.S. Treasury and government agency securities | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 16 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | U.S. Treasury and government agency securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Municipal bonds |  |
Assets: |  |
Investments in trusts | 1 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Municipal bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Municipal bonds | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 1 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Municipal bonds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Corporate bonds |  |
Assets: |  |
Investments in trusts | 307 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Corporate bonds | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 307 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Corporate bonds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Mortgage- and asset-backed securities |  |
Assets: |  |
Investments in trusts | 33 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Mortgage- and asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Mortgage- and asset-backed securities | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 33 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Mortgage- and asset-backed securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Private equity |  |
Assets: |  |
Investments in trusts | 186 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Private equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Private equity | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Private equity | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Private equity | Net Asset Value as a Practical Expedient (NAV) |  |
Assets: |  |
Investments in trusts | 186 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Other |  |
Assets: |  |
Investments in trusts | 30 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Other | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 19 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Other | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 2 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Other | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | ALABAMA POWER CO | Other | Net Asset Value as a Practical Expedient (NAV) |  |
Assets: |  |
Investments in trusts | 9 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO |  |
Assets: |  |
Cash equivalents and restricted cash | 844 |
Total | 2,230 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents and restricted cash | 844 |
Total | 1,300 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents and restricted cash | 0 |
Total | 930 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents and restricted cash | 0 |
Total | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Energy-related derivatives |  |
Assets: |  |
Derivatives | 27 |
Liabilities: |  |
Derivatives | 24 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Energy-related derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Energy-related derivatives | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivatives | 27 |
Liabilities: |  |
Derivatives | 24 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Energy-related derivatives | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Domestic equity |  |
Assets: |  |
Investments in trusts | 436 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Domestic equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 435 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Domestic equity | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 1 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Domestic equity | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Foreign equity |  |
Assets: |  |
Investments in trusts | 215 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Foreign equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Foreign equity | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 215 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Foreign equity | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | U.S. Treasury and government agency securities |  |
Assets: |  |
Investments in trusts | 351 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | U.S. Treasury and government agency securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | U.S. Treasury and government agency securities | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 351 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | U.S. Treasury and government agency securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Municipal bonds |  |
Assets: |  |
Investments in trusts | 49 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Municipal bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Municipal bonds | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 49 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Municipal bonds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Corporate bonds |  |
Assets: |  |
Investments in trusts | 198 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Corporate bonds | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 198 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Corporate bonds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Mortgage- and asset-backed securities |  |
Assets: |  |
Investments in trusts | 87 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Mortgage- and asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Mortgage- and asset-backed securities | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 87 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Mortgage- and asset-backed securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Other |  |
Assets: |  |
Investments in trusts | 23 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Other | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Investments in trusts | 21 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Other | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investments in trusts | 2 |
Fair Value, Measurements, Recurring | GEORGIA POWER CO | Other | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investments in trusts | 0 |
Fair Value, Measurements, Recurring | MISSISSIPPI POWER CO |  |
Assets: |  |
Cash equivalents and restricted cash | 13 |
Total | 33 |
Liabilities: |  |
Derivatives | 23 |
Fair Value, Measurements, Recurring | MISSISSIPPI POWER CO | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents and restricted cash | 13 |
Total | 13 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | MISSISSIPPI POWER CO | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents and restricted cash | 0 |
Total | 20 |
Liabilities: |  |
Derivatives | 23 |
Fair Value, Measurements, Recurring | MISSISSIPPI POWER CO | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents and restricted cash | 0 |
Total | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | MISSISSIPPI POWER CO | Energy-related derivatives |  |
Assets: |  |
Derivatives | 20 |
Fair Value, Measurements, Recurring | MISSISSIPPI POWER CO | Energy-related derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | MISSISSIPPI POWER CO | Energy-related derivatives | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivatives | 20 |
Fair Value, Measurements, Recurring | MISSISSIPPI POWER CO | Energy-related derivatives | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO |  |
Assets: |  |
Cash equivalents and restricted cash | 813 |
Total | 837 |
Liabilities: |  |
Contingent consideration | 17 |
Total | 42 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents and restricted cash | 813 |
Total | 813 |
Liabilities: |  |
Contingent consideration | 3 |
Total | 3 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents and restricted cash | 0 |
Total | 24 |
Liabilities: |  |
Contingent consideration | 0 |
Total | 14 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents and restricted cash | 0 |
Total | 0 |
Liabilities: |  |
Contingent consideration | 14 |
Total | 25 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Energy-related derivatives |  |
Assets: |  |
Derivatives | 4 |
Liabilities: |  |
Derivatives | 1 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Energy-related derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Energy-related derivatives | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivatives | 4 |
Liabilities: |  |
Derivatives | 1 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Energy-related derivatives | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Foreign currency derivatives |  |
Assets: |  |
Derivatives | 20 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Foreign currency derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Foreign currency derivatives | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivatives | 20 |
Fair Value, Measurements, Recurring | SOUTHERN POWER CO | Foreign currency derivatives | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS |  |
Assets: |  |
Cash equivalents and restricted cash | 329 |
Total | 368 |
Liabilities: |  |
Total | 72 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents and restricted cash | 329 |
Total | 345 |
Liabilities: |  |
Total | 12 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents and restricted cash | 0 |
Total | 23 |
Liabilities: |  |
Total | 60 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents and restricted cash | 0 |
Total | 0 |
Liabilities: |  |
Total | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Energy-related derivatives |  |
Assets: |  |
Derivatives | 22 |
Liabilities: |  |
Derivatives | 16 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Energy-related derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivatives | 15 |
Liabilities: |  |
Derivatives | 12 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Energy-related derivatives | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivatives | 7 |
Liabilities: |  |
Derivatives | 4 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Energy-related derivatives | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivatives | 0 |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Interest rate derivatives |  |
Liabilities: |  |
Derivatives | 56 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Interest rate derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Interest rate derivatives | Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Derivatives | 56 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Interest rate derivatives | Significant Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Derivatives | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Domestic equity |  |
Assets: |  |
Non-qualified deferred compensation trusts | 9 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Domestic equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Domestic equity | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 9 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Domestic equity | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Foreign equity |  |
Assets: |  |
Non-qualified deferred compensation trusts | 1 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Foreign equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Foreign equity | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 1 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Foreign equity | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Pooled funds – fixed income |  |
Assets: |  |
Non-qualified deferred compensation trusts | 6 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Pooled funds – fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Pooled funds – fixed income | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 6 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Pooled funds – fixed income | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Cash and cash equivalents |  |
Assets: |  |
Non-qualified deferred compensation trusts | 1 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 1 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Cash and cash equivalents | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Non-qualified deferred compensation trusts | 0 |
Fair Value, Measurements, Recurring | SOUTHERN Co GAS | Cash and cash equivalents | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Non-qualified deferred compensation trusts | $ 0 |

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