Regulatory Matters - GPC Base Rate Case (Details) $ in Millions	Jun. 24, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Proposed alternate rate plan	3 years
GEORGIA POWER CO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	$ 852
Requested rate increase (decrease), amount, due in 2024	107
Requested rate increase (decrease), amount, due in 2025	$ 45
Base rate case filing, measurement input, return on investment	11.00%
Base rate case filing, measurement input, maximum equity ratio	56.00%
Portion of actual earnings above approved ROE band refunded to customers	80.00%
Portion of actual earnings above approved ROE band retained by subsidiary company	20.00%
GEORGIA POWER CO | Minimum
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity	9.50%
GEORGIA POWER CO | Maximum
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity	12.00%