Vogtle Units No. 3 and No. 4 Construction Project - Project Budget and Actual Costs (Details) - Vogtle Units No. 3 & No. 4 $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Actual Costs at March 31, 2022
Proceeds from guarantee agreement	$ 1,100
Jointly Owned Nuclear Power Plant
Project Budget - No Tender
Construction Costs	6,487
Financing Costs	1,922
Total Costs	8,409
Project-Level Contingency	70
Oglethorpe-Level Contingency	21
Total Contingency	91
Totals	8,500
Project Budget - Tender
Construction Costs	6,096
Financing Costs	1,914
Total Costs	8,010
Project-Level Contingency	70
Oglethorpe-Level Contingency	20
Total Contingency	90
Totals	8,100
Actual Costs at March 31, 2022
Construction Costs	5,621
Financing Costs	1,561
Total Costs	7,182
Project-Level Contingency	0
Oglethorpe-Level Contingency	0
Total Contingency	0
Totals	$ 7,182