Regulatory Matters - GPC Nuclear Construction Regulatory Matters (Details) - Plant Vogtle Units 3 And 4 - GEORGIA POWER CO $ in Millions							6 Months Ended		9 Months Ended	12 Months Ended
	Jan. 01, 2023 USD ($)	Jan. 01, 2021	Jan. 01, 2020	Jan. 11, 2018 USD ($)	Jan. 01, 2018	Jan. 01, 2016	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) claim	Sep. 30, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2009 USD ($)	Jun. 30, 2021 report	Jun. 30, 2018 USD ($)	Dec. 31, 2013
Public Utilities, General Disclosures [Line Items]
Estimated in-service capital cost													$ 4,418
Financing costs collected, net of tax									$ 3,000
Increase (decrease) in tariff	$ 36
Additional construction capital costs				$ 3,300
Payments for contractor settlement agreement				300
Amendment to estimated in-service capital cost				$ 5,680
Retail rate of return on common equity																10.95%
Public utilities, approved return on equity percentage		5.30%	8.30%		10.00%	10.00%
Public utilities, approved return on equity, monthly percentage increase (decrease)									(0.10%)
Return on equity reduction, negative impact on earnings									$ 12			$ 300
Increase to base capital cost forecast not seeking recovery															$ 700
Twenty Fourth Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Cost settlement agreement revised forecast, net of payments									7,300
Twenty Fifth Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Number of approved construction management reports | report														25
Requested capital construction costs									7,900
Guarantor obligations									1,700
Customer refund									$ 188
Twenty Sixth Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Requested capital construction costs								$ 1,600
Number of additional reports reviewed | claim								3
Twenty Ninth Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Cost settlement agreement revised forecast, net of payments							$ 10,600
Requested capital construction costs							$ 390
Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Return on equity reduction, negative impact on earnings										$ 60	$ 290