Condensed Statements of Cash Flows (Unaudited) - MPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities:
Net income (loss)	$ 991	$ 1,107
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	989	964
Deferred income taxes	40	140
Other, net	7	114
Changes in certain current assets and liabilities —
-Receivables	(217)	308
-Retail fuel cost over recovery	0	(53)
-Other current assets	87	90
-Accounts payable	132	(216)
-Accrued taxes	(58)	(212)
-Accrued compensation	(470)	(417)
-Other current liabilities	35	(63)
Net cash provided from operating activities	1,592	1,242
Investing Activities:
Property additions	(1,419)	(1,678)
Construction payables	23	(116)
Payments pursuant to LTSAs	(37)	(60)
Other investing activities	110	45
Net cash used for investing activities	(1,555)	(2,243)
Financing Activities:
Increase in notes payable	137	182
Payment of common stock dividends	(702)	(678)
Net cash provided from (used for) financing activities	(193)	1,734
Net Change in Cash, Cash Equivalents, and Restricted Cash	(156)	733
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,673	1,801
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	515	519
Noncash transactions —
Accrued property additions at year-end	863	872
Mississippi Power
Operating Activities:
Net income (loss)	42	45
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	55	53
Deferred income taxes	(5)	4
Other, net	17	(14)
Changes in certain current assets and liabilities —
-Receivables	(7)	7
-Retail fuel cost over recovery	(11)	0
-Other current assets	(11)	1
-Accounts payable	(9)	(30)
-Accrued taxes	(63)	(75)
-Accrued compensation	(18)	(16)
-Other current liabilities	(6)	(13)
Net cash provided from operating activities	(16)	(38)
Investing Activities:
Property additions	(45)	(45)
Construction payables	(8)	(8)
Payments pursuant to LTSAs	(8)	(7)
Other investing activities	(7)	(7)
Net cash used for investing activities	(68)	(67)
Financing Activities:
Increase in notes payable	25	29
Capital contributions from parent company	50	100
Payment of common stock dividends	(43)	(39)
Net cash provided from (used for) financing activities	32	90
Net Change in Cash, Cash Equivalents, and Restricted Cash	(52)	(15)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	61	39
Cash, Cash Equivalents, and Restricted Cash at End of Period	9	24
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	22	16
Noncash transactions —
Accrued property additions at year-end	$ 17	$ 26