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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Accounts Receivable	$ 3,123	$ 2,504
Contract Assets	156	117
Contract Liabilities	45	57
Contract with customer, liability, revenue recognized	36	29
Unregulated Distributed Generation
Disaggregation of Revenue [Line Items]
Contract Assets	65	50
Contract Liabilities	32	39
Alabama Power
Disaggregation of Revenue [Line Items]
Accounts Receivable	696	589
Contract Assets	2	2
Contract Liabilities	4	4
Georgia Power
Disaggregation of Revenue [Line Items]
Accounts Receivable	922	736
Contract Assets	89	63
Contract Liabilities	9	14
Mississippi Power
Disaggregation of Revenue [Line Items]
Accounts Receivable	92	73
Contract Assets	0	0
Contract Liabilities	0	0
Southern Power
Disaggregation of Revenue [Line Items]
Accounts Receivable	237	149
Contract Assets	0	1
Contract Liabilities	1	1
Southern Company Gas
Disaggregation of Revenue [Line Items]
Accounts Receivable	1,107	753
Contract Assets	0	0
Contract Liabilities	$ 0	$ 0

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 310
-Section 45
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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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-SubTopic 10
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