Regulatory Matters - GPC Nuclear Construction Regulatory Matters (Details) - Plant Vogtle Units 3 And 4 - Georgia Power $ in Millions						1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Jan. 01, 2021	Aug. 31, 2020 USD ($)	Jan. 01, 2020	Jan. 11, 2018 USD ($)	Jan. 01, 2016	Nov. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) report	Dec. 31, 2009 USD ($)	Dec. 31, 2013
Public Utilities, General Disclosures [Line Items]
Estimated in-service capital cost												$ 4,418
Financing costs collected, net of tax							$ 2,600
Cost settlement agreement revised forecast, net of payments				$ 7,300
Requested decrease in NCCR tariff						$ 142
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%
Public utilities, approved return on equity, monthly percentage decrease							0.10%
Return on equity reduction, negative impact on earnings											$ 150
Twenty Third Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Number of approved construction management reports | report											23
Requested capital construction costs								$ 8,100
Guarantor obligations							$ 1,700	1,700
Customer refund							$ 188	$ 188
Twenty Fourth Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Requested capital construction costs		$ 670
Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Return on equity reduction, negative impact on earnings									$ 200	$ 265