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Segment and Related Information - Schedule of Financial Data for Products and Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Concentration Risk [Line Items]
Operating revenues	$ 6,463	$ 5,748	$ 13,109	$ 12,228
Electric Utilities
Concentration Risk [Line Items]
Operating revenues	5,456	4,764	10,271	9,247
Southern Company Gas' Revenues
Concentration Risk [Line Items]
Operating revenues	831	852	2,538	2,728
Retail electric revenues
Concentration Risk [Line Items]
Operating revenues	4,486	3,859	8,427	7,458
Retail electric revenues | Electric Utilities
Concentration Risk [Line Items]
Operating revenues	4,486	3,859	8,427	7,458
Wholesale electric revenues
Concentration Risk [Line Items]
Operating revenues	627	605	1,198	1,203
Wholesale electric revenues | Electric Utilities
Concentration Risk [Line Items]
Operating revenues	627	605	1,198	1,203
Other Revenue | Electric Utilities
Concentration Risk [Line Items]
Operating revenues	343	300	646	586
Gas Distribution Operations | Southern Company Gas' Revenues
Concentration Risk [Line Items]
Operating revenues	747	761	2,206	2,372
Gas marketing services | Southern Company Gas' Revenues
Concentration Risk [Line Items]
Operating revenues	70	75	305	320
Other | Southern Company Gas' Revenues
Concentration Risk [Line Items]
Operating revenues	$ 14	$ 16	$ 27	$ 36

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