Vogtle Units No. 3 and No. 4 Construction Project - Project Budget and Actual Costs (Details) - Vogtle Units No. 3 & No. 4 - USD ($) $ in Millions		3 Months Ended
	Feb. 18, 2019	Mar. 31, 2023
Actual Costs
Proceeds from guarantee agreement		$ 1,100
Cost sharing benefits		99
Investment in excess of tender option		200
Global Amendments To Term Sheet
Project Budget
Totals		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		6,559
Freeze Capital Credit		(532)
Financing Costs		2,038
Subtotal		8,065
Deferred Training Costs		47
Total Project Costs Before Contingency		8,112
Oglethorpe Contingency		3
Totals		8,115
Actual Costs
Construction Costs		6,286
Freeze Capital Credit		0
Financing Costs		1,844
Subtotal		8,130
Deferred Training Costs		47
Total Project Costs Before Contingency		8,177
Oglethorpe Contingency		0
Totals		8,177
Jointly Owned Nuclear Power Plant | Global Amendments To Term Sheet
Project Budget
Totals		$ 17,100