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ACQUISITIONS AND DISPOSITIONS - Southern Power Narrative (Details) - SOUTHERN POWER CO - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Asset Acquisition [Line Items] |  |  |
Gain on dispositions, net | $ 20 | $ 2 | $ 41
South Cheyenne Solar Facility and Millers Branch Solar Development |  |  |
Asset Acquisition [Line Items] |  |  |
Payments to acquire businesses | 193 |  |
Wind Generating Facility |  |  |
Asset Acquisition [Line Items] |  |  |
Gain on dispositions, net | $ 37 |  | $ 37

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