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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets and Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment	$ 119
Goodwill	5,161	$ 5,161	$ 5,280
Southern Company Gas
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 5,015	$ 5,015

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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