Statements of Cash Flows - MPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities:
Net Income	$ 3,849	$ 3,428	$ 2,309
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	4,986	4,064	3,973
Deferred income taxes	63	670	(49)
Pension, postretirement, and other employee benefits	(527)	(436)	(305)
Settlement of asset retirement obligations	(617)	(455)	(456)
Retail fuel cost under recovery – long-term	(206)	(2,166)	(536)
Other, net	(138)	(25)	(89)
Changes in certain current assets and liabilities —
-Receivables	482	(771)	(77)
-Materials and supplies	(345)	(160)	(130)
-Other current assets	(106)	(186)	(270)
-Accounts payable	(863)	1,021	(8)
-Other current liabilities	214	204	(258)
Net cash provided from operating activities	7,553	6,302	6,169
Investing Activities:
Property additions	(9,095)	(7,923)	(7,586)
Cost of removal net of salvage	(592)	(649)	(442)
Payments pursuant to LTSAs	(99)	(190)	(188)
Other investing activities	(43)	(133)	75
Net cash used for investing activities	(9,668)	(8,430)	(7,353)
Financing Activities:
Increase (decrease) in notes payable, net		(337)
Redemptions —
Payment of common stock dividends	(3,035)	(2,907)	(2,777)
Other financing activities	(160)	(218)	(266)
Net cash provided from financing activities	999	2,336	1,945
Net Change in Cash, Cash Equivalents, and Restricted Cash	(1,116)	208	761
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	2,037	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Year	921	2,037	1,829
Supplemental Cash Flow Information:
Interest	2,184	1,758	1,718
Income taxes, net	132	146	93
Noncash transactions —
Accrued property additions at year-end	1,027	1,024	866
Mississippi Power
Operating Activities:
Net Income	188	164	159
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	232	223	213
Deferred income taxes	(13)	(6)	(4)
Pension, postretirement, and other employee benefits	(20)	(18)	(10)
Settlement of asset retirement obligations	(18)	(20)	(24)
System restoration rider and reliability reserve accruals	23	32	(2)
Retail fuel cost under recovery – long-term	(50)	0	0
Other, net	(5)	21	(21)
Changes in certain current assets and liabilities —
-Receivables	85	(82)	9
-Materials and supplies	(9)	(10)	(6)
-Other current assets	7	(15)	0
-Accounts payable	(81)	97	(35)
-Accrued taxes	(7)	5	6
-Retail fuel cost over recovery	27	0	(24)
-Other current liabilities	10	(8)	(15)
Net cash provided from operating activities	369	383	246
Investing Activities:
Property additions	(319)	(257)	(198)
Cost of removal net of salvage	(32)	(27)	(20)
Payments pursuant to LTSAs	(26)	(29)	(29)
Other investing activities	7	(4)	(10)
Net cash used for investing activities	(370)	(317)	(257)
Financing Activities:
Increase (decrease) in notes payable, net	0	0	(25)
Proceeds —
Senior notes	100	0	525
Revenue bonds	0	35	0
Redemptions —
Revenue bonds	0	0	(320)
Other long-term debt	0	0	(100)
Capital contributions from parent company	68	68	120
Payment of common stock dividends	(185)	(170)	(157)
Other financing activities	(3)	(1)	(10)
Net cash provided from financing activities	(20)	(68)	33
Net Change in Cash, Cash Equivalents, and Restricted Cash	(21)	(2)	22
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	59	61	39
Cash, Cash Equivalents, and Restricted Cash at End of Year	38	59	61
Supplemental Cash Flow Information:
Interest	66	55	58
Income taxes, net	52	33	16
Noncash transactions —
Accrued property additions at year-end	$ 34	$ 22	$ 25