Statements of Common Stockholders' Equity - MPC - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Mississippi Power	Mississippi Power Common Stock	Mississippi Power Paid-In Capital	Mississippi Power Retained Earnings	Mississippi Power Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2021		1,061				1
Beginning balance at Dec. 31, 2021					$ 1,867	$ 38	$ 4,582	$ (2,753)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 3,524				164			164
Capital contributions from parent company					70		70
Other comprehensive income	71			$ 71
Cash dividends on common stock	(2,907)		$ (2,907)		(170)			(170)
Ending balance (in shares) at Dec. 31, 2022		1,090				1
Ending balance at Dec. 31, 2022					1,931	$ 38	4,652	(2,759)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,976				188			188
Capital contributions from parent company					69		69
Other comprehensive income	(10)			(10)
Cash dividends on common stock	(3,035)		(3,035)		(185)			(185)
Ending balance (in shares) at Dec. 31, 2023		1,092				1
Ending balance at Dec. 31, 2023	31,444				2,003	$ 38	4,721	(2,756)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,401				199			199
Capital contributions from parent company					70		70
Other comprehensive income	99			$ 99	5				5
Cash dividends on common stock	(3,133)		$ (3,133)		(188)			(188)
Ending balance (in shares) at Dec. 31, 2024		1,098				1
Ending balance at Dec. 31, 2024	$ 33,208				$ 2,089	$ 38	$ 4,791	$ (2,745)	$ 5