Vogtle Units No. 3 and No. 4 Construction Project - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) unit MW	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Vogtle Units No. 3 & No. 4
Public Utility Property Plant and Equipment
Ownership interest (as a percent)	30.00%
Vogtle Units No. 3 & No. 4 | EPC Agreement | Westinghouse Electric Company LLC and Stone & Webster, Inc.
Public Utility Property Plant and Equipment
Number of nuclear units | unit	2
Vogtle Units No. 3 & No. 4 | Ownership participation agreement
Public Utility Property Plant and Equipment
Ownership share, generating capacity (in megawatts) | MW	660
Project budget	$ 8,300,000,000
Proceeds from settlement agreement	1,100,000,000
Total construction costs paid	8,200,000,000
Vogtle Units No. 3 & No. 4 | Global Amendments to Term Sheet | Jointly Owned Nuclear Power Plant | Georgia Power
Public Utility Property Plant and Equipment
Total construction costs paid	404,000,000
Vogtle Unit Number 3 | Georgia Power
Public Utility Property Plant and Equipment
Nuclear production tax credit	$ 12,100,000	$ 0	$ 21,700,000