Acquisitions and Dispositions - Schedule of Construction Projects (Details) - SOUTHERN POWER CO - MW	1 Months Ended		5 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Feb. 28, 2022	Mar. 31, 2022	Feb. 28, 2022	Sep. 30, 2022	Dec. 31, 2021
Garland Solar Storage
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)					88
PPA Contract Period				20 years
Nameplate capacity placed in service (in MWs)		15			15	73
Tranquillity Solar Storage
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)					72
PPA Contract Period			20 years
Nameplate capacity placed in service (in MWs)	40				40	32