Regulatory Matters - GPC Nuclear Construction Cost and Schedule (Details) - GEORGIA POWER CO $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Pre-tax charge to income	$ 440
Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Base project capital cost forecast	10,294
Construction contingency estimate	107
Total project capital cost forecast	10,401
Net investment as of end of the period	(8,715)
Remaining estimate to complete	1,686
Estimated cost to complete, costs not shared with other owners	590
Expected capitalized costs	377
Capitalized interest accrued	221
Plant Vogtle Units 3 And 4 | Twenty Fifth Vogtle Construction Monitoring Report
Loss Contingencies [Line Items]
Guarantor obligations	1,700
Customer refund	$ 188