Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - Southern - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2023		1,092
Beginning balance (in shares) at Dec. 31, 2023			(1)
Beginning balance at Dec. 31, 2023	$ 35,225	$ 5,423	$ (59)	$ 13,775	$ 12,482	$ (177)	$ 3,781
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,071				1,129		(58)
Other comprehensive income	37					37
Stock issued (in shares)		3
Stock issued	61	$ 8		53
Stock-based compensation	8			8
Cash dividends	(766)				(766)
Capital contributions from noncontrolling interests	9						9
Distributions to noncontrolling interests	(38)						(38)
Other	7		$ (2)	10	(1)
Ending balance (in shares) at Mar. 31, 2024		1,095
Ending balance (in shares) at Mar. 31, 2024			(1)
Ending balance at Mar. 31, 2024	35,614	$ 5,431	$ (61)	13,846	12,844	(140)	3,694
Beginning balance (in shares) at Dec. 31, 2023		1,092
Beginning balance (in shares) at Dec. 31, 2023			(1)
Beginning balance at Dec. 31, 2023	35,225	$ 5,423	$ (59)	13,775	12,482	(177)	3,781
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,259
Other comprehensive income	46
Ending balance (in shares) at Jun. 30, 2024		1,096
Ending balance (in shares) at Jun. 30, 2024			(1)
Ending balance at Jun. 30, 2024	36,111	$ 5,436	$ (63)	13,947	13,259	(130)	3,662
Beginning balance (in shares) at Mar. 31, 2024		1,095
Beginning balance (in shares) at Mar. 31, 2024			(1)
Beginning balance at Mar. 31, 2024	35,614	$ 5,431	$ (61)	13,846	12,844	(140)	3,694
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,188				1,203		(15)
Other comprehensive income	10					10
Stock issued (in shares)		1
Stock issued	90	$ 5		85
Stock-based compensation	13			13
Cash dividends	(788)				(788)
Capital contributions from noncontrolling interests	2						2
Distributions to noncontrolling interests	(19)						(19)
Other	1		$ (2)	3
Ending balance (in shares) at Jun. 30, 2024		1,096
Ending balance (in shares) at Jun. 30, 2024			(1)
Ending balance at Jun. 30, 2024	36,111	$ 5,436	$ (63)	13,947	13,259	(130)	3,662
Beginning balance (in shares) at Dec. 31, 2024		1,098
Beginning balance (in shares) at Dec. 31, 2024			(1)
Beginning balance at Dec. 31, 2024	36,674	$ 5,446	$ (59)	14,149	13,750	(78)	3,466
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,270				1,334		(64)
Other comprehensive income	3					3
Stock issued (in shares)		2
Stock issued	85	$ 7		78
Stock-based compensation	5			5
Cash dividends	(791)				(791)
Capital contributions from noncontrolling interests	19						19
Distributions to noncontrolling interests	(37)						(37)
Other	(5)		$ (2)	(1)	(2)
Ending balance (in shares) at Mar. 31, 2025		1,100
Ending balance (in shares) at Mar. 31, 2025			(1)
Ending balance at Mar. 31, 2025	37,223	$ 5,453	$ (61)	14,231	14,291	(75)	3,384
Beginning balance (in shares) at Dec. 31, 2024		1,098
Beginning balance (in shares) at Dec. 31, 2024			(1)
Beginning balance at Dec. 31, 2024	36,674	$ 5,446	$ (59)	14,149	13,750	(78)	3,466
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,123
Other comprehensive income	7
Ending balance (in shares) at Jun. 30, 2025		1,101
Ending balance (in shares) at Jun. 30, 2025			(1)
Ending balance at Jun. 30, 2025	37,342	$ 5,458	$ (62)	14,332	14,357	(71)	3,328
Beginning balance (in shares) at Mar. 31, 2025		1,100
Beginning balance (in shares) at Mar. 31, 2025			(1)
Beginning balance at Mar. 31, 2025	37,223	$ 5,453	$ (61)	14,231	14,291	(75)	3,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	853				880		(27)
Other comprehensive income	4					4
Stock issued (in shares)		1
Stock issued	89	$ 5		84
Stock-based compensation	11			11
Cash dividends	(815)				(815)
Capital contributions from noncontrolling interests	4						4
Distributions to noncontrolling interests	(33)						(33)
Other	6		$ (1)	6	1		0
Ending balance (in shares) at Jun. 30, 2025		1,101
Ending balance (in shares) at Jun. 30, 2025			(1)
Ending balance at Jun. 30, 2025	$ 37,342	$ 5,458	$ (62)	$ 14,332	$ 14,357	$ (71)	$ 3,328