Regulatory Matters - GPC Nuclear Construction Regulatory Matters (Details) - Plant Vogtle Units 3 And 4 - Georgia Power $ in Millions						6 Months Ended	9 Months Ended	12 Months Ended
	Oct. 01, 2021 USD ($)	Jan. 01, 2021	Jan. 01, 2020	Jan. 11, 2018 USD ($)	Jan. 01, 2016	Jun. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) report	Dec. 31, 2009 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2013
Public Utilities, General Disclosures [Line Items]
Estimated in-service capital cost												$ 4,418
Financing costs collected, net of tax							$ 2,700
Additional construction capital costs				$ 3,300			$ 350
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%
Public utilities, approved return on equity, monthly percentage decrease							0.10%
Return on equity reduction, negative impact on earnings											$ 150
Increase to base capital cost forecast not seeking recovery													$ 700
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested decrease in tariff	$ 78
Twenty Fourth Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Number of approved construction management reports | report											24
Requested capital construction costs						$ 9,200					$ 7,300
Guarantor obligations							$ 1,700
Customer refund							188
Twenty Fifth Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Cost settlement agreement revised forecast, net of payments							$ 7,300
Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Return on equity reduction, negative impact on earnings								$ 135	$ 260	$ 270