Statements of Cash Flows - MPC - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities:
Consolidated net income	$ 2,309,000	$ 3,103,000	$ 4,744,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	3,973,000	3,905,000	3,331,000
Deferred income taxes	(49,000)	(241,000)	611,000
Pension and postretirement funding	0	(2,000)	(1,136,000)
Settlement of asset retirement obligations	(456,000)	(442,000)	(328,000)
Other, net	86,000	(74,000)	115,000
Changes in certain current assets and liabilities —
-Receivables	(81,000)	(222,000)	630,000
-Other current assets	(170,000)	(161,000)	12,000
-Accounts payable	(8,000)	(27,000)	(693,000)
-Accrued taxes	(54,000)	242,000	117,000
-Other current liabilities	(49,000)	76,000	(73,000)
Net cash provided from operating activities	6,169,000	6,696,000	5,781,000
Investing Activities:
Property additions	(7,240,000)	(7,441,000)	(7,555,000)
Payments pursuant to LTSAs	(188,000)	(211,000)	(234,000)
Other investing activities	74,000	(16,000)	(107,000)
Net cash used for investing activities	(7,353,000)	(7,030,000)	(3,392,000)
Financing Activities:
Increase (decrease) in notes payable, net	530,000		640,000
Increase (decrease) in notes payable, net		(1,096,000)
Proceeds —
Short-term borrowings	325,000	615,000	350,000
Redemptions and repurchases —
Short-term borrowings	(25,000)	(840,000)	(1,850,000)
Payment of common stock dividends	(2,777,000)	(2,685,000)	(2,570,000)
Other financing activities	(266,000)	(325,000)	(157,000)
Net cash provided from (used for) financing activities	1,945,000	(576,000)	(1,930,000)
Net Change in Cash, Cash Equivalents, and Restricted Cash	761,000	(910,000)	459,000
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	1,068,000	1,978,000	1,519,000
Cash, Cash Equivalents, and Restricted Cash at End of Year	1,829,000	1,068,000	1,978,000
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,718,000	1,683,000	1,651,000
Income taxes, net	93,000	64,000	276,000
Noncash transactions —
Accrued property additions at year-end	866,000	989,000	932,000
Mississippi Power
Operating Activities:
Consolidated net income	159,000	152,000	139,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	213,000	191,000	197,000
Deferred income taxes	(4,000)	(4,000)	37,000
Pension and postretirement funding	0	0	(54,000)
Settlement of asset retirement obligations	(24,000)	(22,000)	(35,000)
Other, net	(33,000)	(1,000)	35,000
Changes in certain current assets and liabilities —
-Receivables	9,000	(7,000)	6,000
-Prepaid income taxes	3,000	(3,000)	12,000
-Other current assets	(9,000)	(28,000)	(8,000)
-Accounts payable	(35,000)	20,000	3,000
-Accrued taxes	6,000	10,000	11,000
-Over recovered regulatory clause revenues	(34,000)	5,000	16,000
-Other current liabilities	(5,000)	(15,000)	(20,000)
Net cash provided from operating activities	246,000	298,000	339,000
Investing Activities:
Property additions	(213,000)	(274,000)	(202,000)
Payments pursuant to LTSAs	(29,000)	(28,000)	(23,000)
Contributions in aid of construction	15,000	0	0
Other investing activities	(30,000)	(21,000)	(38,000)
Net cash used for investing activities	(257,000)	(323,000)	(263,000)
Financing Activities:
Increase (decrease) in notes payable, net		25,000
Increase (decrease) in notes payable, net	(25,000)		0
Proceeds —
Senior notes	525,000	0	0
Short-term borrowings	0	40,000	0
Pollution control revenue bonds	0	34,000	43,000
Other long-term debt	0	100,000	0
Redemptions and repurchases —
Senior notes	0	(275,000)	(25,000)
Short-term borrowings	0	(40,000)	0
Pollution control revenue bonds	0	(41,000)	0
Other revenue bonds	(320,000)	0	0
Other long-term debt	(100,000)	0	0
Capital contributions from parent company	120,000	85,000	51,000
Return of capital to parent company	0	(74,000)	(150,000)
Payment of common stock dividends	(157,000)	(74,000)	0
Other financing activities	(10,000)	(2,000)	(2,000)
Net cash provided from (used for) financing activities	33,000	(222,000)	(83,000)
Net Change in Cash, Cash Equivalents, and Restricted Cash	22,000	(247,000)	(7,000)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	39,000	286,000	293,000
Cash, Cash Equivalents, and Restricted Cash at End of Year	61,000	39,000	286,000
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	58,000	63,000	71,000
Income taxes, net	16,000	28,000	(27,000)
Noncash transactions —
Accrued property additions at year-end	$ 25,000	$ 34,000	$ 35,000