Statements of Cash Flows - MPC - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities:
Consolidated net income	$ 3,428,000	$ 2,309,000	$ 3,103,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	4,064,000	3,973,000	3,905,000
Settlement of asset retirement obligations	(455,000)	(456,000)	(442,000)
Other, net	17,000	87,000	(75,000)
Changes in certain current assets and liabilities —
-Receivables	(769,000)	(81,000)	(222,000)
-Other current assets	(288,000)	(270,000)	(132,000)
-Accounts payable	1,021,000	(8,000)	(27,000)
-Other current liabilities	153,000	(204,000)	173,000
Net cash provided from operating activities	6,302,000	6,169,000	6,696,000
Investing Activities:
Property additions	(7,923,000)	(7,586,000)	(7,522,000)
Payments pursuant to LTSAs	(190,000)	(188,000)	(211,000)
Other investing activities	70,000	(49,000)	21,000
Net cash used for investing activities	(8,430,000)	(7,353,000)	(7,030,000)
Financing Activities:
Increase (decrease) in notes payable, net		530,000
Increase (decrease) in notes payable, net	(337,000)		(1,096,000)
Proceeds —
Short-term borrowings	2,650,000	325,000	615,000
Redemptions and repurchases —
Short-term borrowings	(1,150,000)	(25,000)	(840,000)
Payment of common stock dividends	(2,907,000)	(2,777,000)	(2,685,000)
Other financing activities	(218,000)	(266,000)	(325,000)
Net cash provided from (used for) financing activities	2,336,000	1,945,000	(576,000)
Net Change in Cash, Cash Equivalents, and Restricted Cash	208,000	761,000	(910,000)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	1,829,000	1,068,000	1,978,000
Cash, Cash Equivalents, and Restricted Cash at End of Year	2,037,000	1,829,000	1,068,000
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,758,000	1,718,000	1,683,000
Income taxes, net	146,000	93,000	64,000
Noncash transactions —
Accrued property additions at year-end	1,024,000	866,000	989,000
Mississippi Power
Operating Activities:
Consolidated net income	164,000	159,000	152,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	223,000	213,000	191,000
Settlement of asset retirement obligations	(20,000)	(24,000)	(22,000)
System restoration rider and reliability reserve accruals	32,000	(2,000)	1,000
Other, net	(2,000)	(35,000)	(6,000)
Changes in certain current assets and liabilities —
-Receivables	(82,000)	9,000	(7,000)
-Other current assets	(25,000)	(6,000)	(31,000)
-Accounts payable	97,000	(35,000)	20,000
-Over recovered regulatory clause revenues	0	(34,000)	5,000
-Other current liabilities	(4,000)	1,000	(5,000)
Net cash provided from operating activities	383,000	246,000	298,000
Investing Activities:
Property additions	(276,000)	(213,000)	(274,000)
Payments pursuant to LTSAs	(29,000)	(29,000)	(28,000)
Contributions in aid of construction	19,000	15,000	0
Other investing activities	(31,000)	(30,000)	(21,000)
Net cash used for investing activities	(317,000)	(257,000)	(323,000)
Financing Activities:
Increase (decrease) in notes payable, net			25,000
Increase (decrease) in notes payable, net	0	(25,000)
Proceeds —
Senior notes	0	525,000	0
Short-term borrowings	0	0	40,000
Revenue bonds	35,000	0	34,000
Other long-term debt	0	0	100,000
Redemptions and repurchases —
Senior notes	0	0	(275,000)
Short-term borrowings	0	0	(40,000)
Revenue bonds	0	(320,000)	(41,000)
Other long-term debt	0	(100,000)	0
Capital contributions from parent company	68,000	120,000	85,000
Return of capital to parent company	0	0	(74,000)
Payment of common stock dividends	(170,000)	(157,000)	(74,000)
Other financing activities	(1,000)	(10,000)	(2,000)
Net cash provided from (used for) financing activities	(68,000)	33,000	(222,000)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(2,000)	22,000	(247,000)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	61,000	39,000	286,000
Cash, Cash Equivalents, and Restricted Cash at End of Year	59,000	61,000	39,000
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	55,000	58,000	63,000
Income taxes, net	33,000	16,000	28,000
Noncash transactions —
Accrued property additions at year-end	$ 22,000	$ 25,000	$ 34,000