REGULATORY MATTERS - GPC Schedule of Nuclear Construction Cost and Schedule (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commitments [Line Items]
Total AFUDC and interest capitalized		$ 282	$ 230	$ 202
Georgia Power
Commitments [Line Items]
Total AFUDC and interest capitalized		190	$ 138	$ 103
Pre-tax charge to income	$ 440
Georgia Power | Plant Vogtle Units 3 and 4
Commitments [Line Items]
Base project capital cost forecast	10,251	10,251
Construction contingency estimate	150	150
Total project capital cost forecast	10,401	10,401
Net investment	(8,442)	(8,442)
Remaining estimate to complete	1,959	1,959
Estimated cost to complete, costs not shared with other owners	590	590
Total AFUDC and interest capitalized		375
Total AFUDC and interest capitalized, accrual amount	$ 195	$ 195