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Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Apr. 29, 2026	Mar. 31, 2026	Mar. 31, 2025
Income Tax Contingency [Line Items]
Effective tax (benefit) rate		14.50%	18.10%
GEORGIA POWER CO
Income Tax Contingency [Line Items]
Payment for PTCs		$ 45
Effective tax (benefit) rate		11.90%	14.20%
GEORGIA POWER CO \| Subsequent Event
Income Tax Contingency [Line Items]
Sale of investment tax credit	$ 33
SOUTHERN POWER CO
Income Tax Contingency [Line Items]
Effective tax (benefit) rate		82.60%	(5.30%)
SOUTHERN POWER CO \| Subsequent Event
Income Tax Contingency [Line Items]
Sale of investment tax credit	12
ALABAMA POWER CO \| Subsequent Event
Income Tax Contingency [Line Items]
Sale of investment tax credit	$ 6