Vogtle Units No. 3 and No. 4 Construction Project - Project Budget and Actual Costs (Details) - Vogtle Units No. 3 & No. 4 - USD ($) $ in Millions		9 Months Ended
	Feb. 18, 2019	Sep. 30, 2023
Actual Costs
Proceeds from guarantee agreement		$ 1,100
Global Amendments to Term Sheet
Project Budget
Total Project Costs		17,100
Actual Costs
Additional construction costs	$ 800
Financial Exposure Term Two | Maximum | Global Amendments to Term Sheet
Actual Costs
Additional construction costs	$ 2,100
Jointly Owned Nuclear Power Plant
Project Budget
Construction Costs		6,208
Financing Costs		2,046
Subtotal		8,254
Deferred Training Costs		46
Total Project Costs		8,300
Actual Costs
Construction Costs		6,413
Financing Costs		1,974
Subtotal		8,387
Deferred Training Costs		47
Total Project Costs		8,434
Jointly Owned Nuclear Power Plant | Global Amendments to Term Sheet
Project Budget
Total Project Costs		$ 17,100