Condensed Statements of Cash Flows (Unaudited) - MPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net income (loss)	$ 3,566	$ 2,592
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	3,084	2,944
Settlement of asset retirement obligations	(314)	(341)
Other, net	(45)	156
Changes in certain current assets and liabilities —
Receivables	(327)	2
Other current assets	(343)	(180)
Accounts payable	805	(45)
Accrued taxes	167	288
Retail fuel cost over recovery	(1)	(150)
Other current liabilities	(32)	(226)
Net cash provided from operating activities	5,017	5,081
Investing Activities:
Property additions	(5,502)	(5,222)
Payments pursuant to LTSAs	(121)	(145)
Other investing activities	73	(12)
Net cash used for investing activities	(5,952)	(5,850)
Financing Activities:
Decrease in notes payable, net	(349)	(203)
Redemptions and repurchases —
Payment of common stock dividends	(2,166)	(2,077)
Other financing activities	(235)	(224)
Net cash provided from financing activities	1,119	1,802
Net Change in Cash, Cash Equivalents, and Restricted Cash	184	1,033
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,013	2,101
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,425	1,417
Income taxes, net	160	92
Noncash transactions —
Accrued property additions at year-end	872	915
Mississippi Power
Operating Activities:
Net income (loss)	150	133
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	164	161
Settlement of asset retirement obligations	(15)	(18)
Other, net	20	(20)
Changes in certain current assets and liabilities —
Receivables	(58)	(19)
Other current assets	(17)	(9)
Accounts payable	41	(12)
Accrued taxes	(3)	(20)
Retail fuel cost over recovery	0	(19)
Other current liabilities	(3)	(18)
Net cash provided from operating activities	279	159
Investing Activities:
Property additions	(165)	(135)
Construction payables	(9)	(11)
Payments pursuant to LTSAs	(23)	(21)
Other investing activities	(22)	(15)
Net cash used for investing activities	(219)	(182)
Financing Activities:
Increase in notes payable, net	0
Decrease in notes payable, net		(25)
Proceeds — Senior notes	0	525
Redemptions and repurchases —
Other revenue bonds	0	(270)
Other long-term debt	0	(75)
Capital contributions from parent company	55	103
Payment of common stock dividends	(128)	(118)
Other financing activities	1	(10)
Net cash provided from financing activities	(72)	130
Net Change in Cash, Cash Equivalents, and Restricted Cash	(12)	107
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	61	39
Cash, Cash Equivalents, and Restricted Cash at End of Period	49	146
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	49	53
Income taxes, net	18	11
Noncash transactions —
Accrued property additions at year-end	$ 16	$ 23