Regulatory Matters - GPC Nuclear Construction (Details) - GEORGIA POWER CO $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2012 utility MW	Aug. 31, 2018
Loss Contingencies [Line Items]
Estimated cost to complete, pre-tax charge to income	$ 36
Estimated cost to complete, pre-tax charge to income, net of tax	$ 27
Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Proportionate ownership share	45.70%	45.70%
Number of construction units approved | utility			2
Electric generating capacity in mega watts under consortium agreement | MW			1,100
Estimated cost to complete, construction contingency estimate, financing costs	$ 3,400	$ 3,400
Estimated cost to complete, construction contingency estimate, financing costs, incurred to date	3,000	3,000
Construction contingency estimate	126	126
Estimated cost to complete, additional construction contingency estimate	36	36
Base project capital cost forecast, monthly		35
Monthly AFUDC		$ 45
Percentage of ownership interest required for voting for continuing construction				90.00%
Plant Vogtle Units 3 And 4 | Vogtle Owners
Loss Contingencies [Line Items]
Period of notice required in the event letters of credit are not renewed		30 days
Minimum | Plant Vogtle Units 3 And 4 | COVID-19
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss, loss of productivity, term		3 months
Estimate of possible loss	160	$ 160
Maximum | Plant Vogtle Units 3 And 4 | COVID-19
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss, loss of productivity, term		4 months
Estimate of possible loss	$ 200	$ 200