Condensed Consolidated Statements of Cash Flows (Unaudited) - GAS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Consolidated net income	$ 1,622	$ 2,079
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	2,436	1,995
Deferred income taxes	(34)	240
Natural gas cost under recovery – long-term	0	192
Other, net	(50)	34
Changes in certain current assets and liabilities —
Receivables	735	(637)
Natural gas for sale, net of temporary LIFO liquidation	196	335
Other current assets	103	(101)
Accounts payable	(997)	703
Other current liabilities	101	(120)
Net cash provided from operating activities	2,900	3,579
Investing Activities:
Property additions	(3,898)	(3,213)
Cost of removal, net of salvage	(270)	(377)
Construction payables	(140)	(3)
Other investing activities	(100)	18
Net cash used for investing activities	(4,288)	(3,460)
Financing Activities:
Decrease in notes payable, net	(375)
Short-term borrowings	250	1,200
Redemptions —
Short-term borrowings	(850)	(400)
Payment of common stock dividends	(1,506)	(1,425)
Net cash provided from (used for) financing activities	1,595	(213)
Net Change in Cash, Cash Equivalents, and Restricted Cash	207	(94)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,244	1,735
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,043	836
Income taxes, net	(40)	157
Accrued property additions at end of period	810	837
Right-of-use assets obtained under operating leases	44	13
SOUTHERN Co GAS
Operating Activities:
Consolidated net income	393	433
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	284	275
Deferred income taxes	52	35
Natural gas cost under recovery – long-term	0	192
Other, net	12	55
Changes in certain current assets and liabilities —
Receivables	667	244
Natural gas for sale, net of temporary LIFO liquidation	196	335
Prepaid income taxes	(3)	(70)
Other current assets	79	(75)
Accounts payable	(276)	101
Natural gas cost over recovery	161	0
Other current liabilities	(35)	(47)
Net cash provided from operating activities	1,530	1,478
Investing Activities:
Property additions	(741)	(637)
Cost of removal, net of salvage	(50)	(53)
Construction payables	11	13
Other investing activities	19	19
Net cash used for investing activities	(761)	(658)
Financing Activities:
Decrease in notes payable, net	(372)	(593)
Short-term borrowings	0	50
Other long-term debt	19	0
Redemptions —
Short-term borrowings	(200)	(150)
Medium-term notes	0	(46)
Capital contributions from parent company	238	349
Payment of common stock dividends	(293)	(260)
Net cash provided from (used for) financing activities	(608)	(650)
Net Change in Cash, Cash Equivalents, and Restricted Cash	161	170
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	83	48
Cash, Cash Equivalents, and Restricted Cash at End of Period	244	218
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	145	129
Income taxes, net	85	210
Accrued property additions at end of period	189	126
Right-of-use assets obtained under operating leases	2	0
ALABAMA POWER CO
Operating Activities:
Consolidated net income	568	737
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	770	494
Deferred income taxes	(142)	117
Other, net	(60)	(67)
Changes in certain current assets and liabilities —
Receivables	16	(296)
Other current assets	(112)	(31)
Accounts payable	(363)	14
Other current liabilities	21	24
Net cash provided from operating activities	656	510
Investing Activities:
Property additions	(865)	(759)
Cost of removal, net of salvage	(83)	(104)
Construction payables	(79)	(8)
Other investing activities	16	(18)
Net cash used for investing activities	(1,011)	(889)
Financing Activities:
Other long-term debt	17	0
Redemptions —
Capital contributions from parent company	352	656
Payment of common stock dividends	(571)	(508)
Net cash provided from (used for) financing activities	(11)	227
Net Change in Cash, Cash Equivalents, and Restricted Cash	(366)	(152)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	687	1,060
Cash, Cash Equivalents, and Restricted Cash at End of Period	321	908
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	192	166
Income taxes, net	52	192
Accrued property additions at end of period	$ 103	$ 141