Regulatory Matters - APC Renewable Generation Certificate (Details) - ALABAMA POWER CO		1 Months Ended
	Oct. 04, 2022 project MW	Apr. 30, 2022 project MW	Sep. 30, 2022 MW
Public Utilities, General Disclosures [Line Items]
Renewable generation certificate, authorized generating capacity (in MWs)			500
Renewable generation certificate, number of projects terminated | project		1
Renewable generation certificate, capacity restored (in MWs)		80
Renewable generation certificate, generating capacity owned by parent			330
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Renewable generation certificate, number of projects approved | project	2
Renewable generation certificate, generating capacity owned by parent	160