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Consolidated Balance Sheets - Southern (Parenthetical) - USD ($) shares in Millions, $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Other intangible assets, amortization | $ 412 | $ 376
Common Stockholders' Equity: |  |
Common stock, par value (in dollars per share) | $ 5 | $ 5
Common stock, shares authorized (in shares) | 1,500.0 | 1,500.0
Common stock, shares issued (in shares) | 1,100.0 | 1,100.0
Treasury stock (in shares) | 1.0 | 1.0

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