Contingencies - General Litigation Matters (Details) - Pending Litigation $ in Millions	1 Months Ended	5 Months Ended	12 Months Ended
	Mar. 31, 2019 plaintiff	Feb. 28, 2022 claim	Dec. 31, 2018 USD ($) plaintiff defendant
GEORGIA POWER CO | Class Action Lawsuit
Loss Contingencies [Line Items]
Complaints filed | claim		8
MISSISSIPPI POWER CO | Purported Violations of Mississippi Consumer Protection Act
Loss Contingencies [Line Items]
Number of plaintiffs			10
Number of defendants | defendant			3
Number of additional plaintiffs	4
Underpayment of refunds | $			$ 23.5