Consolidated Statements of Stockholders' Equity - SPC - USD ($) $ in Millions	Total	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Southern Power	Southern Power Total Common Stockholder's Equity	Southern Power Paid-In Capital	Southern Power Retained Earnings	Southern Power Accumulated Other Comprehensive Income (Loss)	Southern Power Noncontrolling Interests
Beginning balance at Dec. 31, 2020	$ 32,234	$ 11,834	$ 11,311	$ (395)	$ 4,262	$ 6,631	$ 2,369	$ 914	$ 1,522	$ (67)	$ 4,262
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,309					167	266		266		(99)
Return of capital to parent company						(271)	(271)	(271)
Capital contributions from parent company						10	10	10
Other comprehensive income (loss)	158			158		40	40			40
Cash dividends on common stock	(2,777)		(2,777)			(204)	(204)		(204)
Capital contributions from noncontrolling interests	590				590	590					590
Distributions to noncontrolling interests	(351)				(351)	(351)					(351)
Other	(7)	(8)	2			(14)	(14)	(15)	1
Ending balance at Dec. 31, 2021	32,276	11,950	10,929	(237)	4,402	6,598	2,196	638	1,585	(27)	4,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,428					247	354		354		(107)
Capital contributions from parent company						431	431	431
Other comprehensive income (loss)	71			71		10	10			10
Cash dividends on common stock	(2,907)		(2,907)			(198)	(198)		(198)
Capital contributions from noncontrolling interests	88				88	88					88
Distributions to noncontrolling interests	(259)				(259)	(259)					(259)
Other	(6)	9	(8)	(1)		(1)	(1)			(1)	0
Ending balance at Dec. 31, 2022	34,532	13,673	11,538	(167)	4,124	6,916	2,792	1,069	1,741	(18)	4,124
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,849					230	357		357		(127)
Capital contributions from parent company						19	19	19
Other comprehensive income (loss)	(10)			(10)		1	1			1
Cash dividends on common stock	(3,035)		(3,035)			(252)	(252)		(252)
Capital contributions from noncontrolling interests	21				21	21					21
Distributions to noncontrolling interests	(236)				(236)	(236)					(236)
Other	(5)	(1)	3		(1)	(1)	0			0	(1)
Ending balance at Dec. 31, 2023	$ 35,225	$ 13,775	$ 12,482	$ (177)	$ 3,781	$ 6,698	$ 2,917	$ 1,088	$ 1,846	$ (17)	$ 3,781