CONTINGENCIES, COMMITMENTS, AND GUARANTEES - SPC Litigation (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jul. 31, 2021 project
Loss Contingencies [Line Items]
Total operating revenues		$ 25,253	$ 29,279	$ 23,113
Net loss attributable to noncontrolling interests		(127)	(107)	(99)
Other revenues
Loss Contingencies [Line Items]
Total operating revenues		949	732	708
Southern Power
Loss Contingencies [Line Items]
Total operating revenues		2,189	3,369	2,216
Net loss attributable to noncontrolling interests		(127)	(107)	(99)
Southern Power | Other revenues
Loss Contingencies [Line Items]
Total operating revenues		55	$ 36	$ 30
Southern Power | Southern Power vs First Solar | Settled Litigation
Loss Contingencies [Line Items]
Number of solar projects | project					5
Proceeds from legal settlements	$ 36
Litigation settlement		18
Decrease in operating expense, maintenance and operations		11
Net loss attributable to noncontrolling interests		6
Southern Power | Southern Power vs First Solar | Settled Litigation | Other revenues
Loss Contingencies [Line Items]
Total operating revenues		$ 7