Statements of Common Stockholders' Equity - APC - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Alabama Power	Alabama Power Common Stock	Alabama Power Paid-In Capital	Alabama Power Retained Earnings	Alabama Power Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2019		1,054					31
Beginning balance at Dec. 31, 2019	$ 31,759	$ 5,257	$ 11,734	$ 10,877	$ (321)	$ 8,955	$ 1,222	$ 4,755	$ 3,001	$ (23)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated Net Income	3,119					1,150			1,150
Capital contributions from parent company						658		658
Other comprehensive income (loss)	(75)				(75)	4				4
Cash dividends on common stock	(2,685)			(2,685)		(957)			(957)
Other	12		10		1
Ending balance (in shares) at Dec. 31, 2020		1,058					31
Ending balance at Dec. 31, 2020	32,234	$ 5,268	11,834	11,311	(395)	9,810	$ 1,222	5,413	3,194	(19)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated Net Income	2,393					1,238			1,238
Capital contributions from parent company						643		643
Other comprehensive income (loss)	158				158	6				6
Cash dividends on common stock	(2,777)			(2,777)		(984)			(984)
Other	7		8	(2)
Ending balance (in shares) at Dec. 31, 2021		1,061					31
Ending balance at Dec. 31, 2021	32,276	$ 5,279	11,950	10,929	(237)	10,713	$ 1,222	6,056	3,448	(13)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated Net Income	3,524					1,340			1,340
Capital contributions from parent company						654		654
Other comprehensive income (loss)	71				71	4				4
Cash dividends on common stock	(2,907)			(2,907)		(1,016)			(1,016)
Other	6		(9)	8	1	(8)			(8)
Ending balance (in shares) at Dec. 31, 2022		1,090					31
Ending balance at Dec. 31, 2022	$ 34,532	$ 5,417	$ 13,673	$ 11,538	$ (167)	$ 11,687	$ 1,222	$ 6,710	$ 3,764	$ (9)