Condensed Consolidated Statements of Cash Flows (Unaudited) - GAS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating Activities:
Net income	$ 2,259	$ 1,622
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	2,572	2,436
Deferred income taxes	243	(34)
Other, net	(95)	(24)
Changes in certain current assets and liabilities —
Receivables	(284)	758
Natural gas for sale, net of temporary LIFO liquidation	188	196
Natural gas cost under recovery	0	108
Other current assets	(94)	40
Accounts payable	(247)	(997)
Other current liabilities	185	101
Net cash provided from operating activities	3,999	2,900
Investing Activities:
Property additions	(3,895)	(3,898)
Cost of removal, net of salvage	(282)	(270)
Change in construction payables, net	(217)	(140)
Other investing activities	(172)	(100)
Net cash used for investing activities	(4,222)	(4,288)
Financing Activities:
Decrease in notes payable, net	(1,125)	(375)
Redemptions — Short-term borrowings	(550)	(850)
Payment of common stock dividends	(1,487)	(1,506)
Other financing activities	(192)	(187)
Net cash provided from financing activities	513	1,595
Net Change in Cash, Cash Equivalents, and Restricted Cash	290	207
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	921	2,037
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,211	2,244
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,235	1,043
Income taxes, net	62	(40)
Noncash transactions —
Accrued property additions at end of period	805	810
Right-of-use assets obtained under operating leases	98	44
SOUTHERN Co GAS
Operating Activities:
Net income	517	393
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	310	284
Deferred income taxes	211	52
Other, net	50	12
Changes in certain current assets and liabilities —
Receivables	310	667
Natural gas for sale, net of temporary LIFO liquidation	188	196
Natural gas cost under recovery	0	108
Other current assets	(48)	(32)
Accounts payable	(112)	(276)
Natural gas cost over recovery	(43)	161
Other current liabilities	(113)	(35)
Net cash provided from operating activities	1,270	1,530
Investing Activities:
Property additions	(657)	(741)
Cost of removal, net of salvage	(38)	(50)
Change in construction payables, net	20	11
Other investing activities	(21)	19
Net cash used for investing activities	(696)	(761)
Financing Activities:
Decrease in notes payable, net	(274)	(372)
Proceeds — Other long-term debt	9	19
Redemptions — Short-term borrowings	0	(200)
Capital contributions from parent company	3	238
Payment of common stock dividends	(302)	(293)
Other financing activities	(10)	0
Net cash provided from financing activities	(574)	(608)
Net Change in Cash, Cash Equivalents, and Restricted Cash	0	161
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	35	83
Cash, Cash Equivalents, and Restricted Cash at End of Period	35	244
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	164	145
Income taxes, net	(52)	85
Noncash transactions —
Accrued property additions at end of period	159	189
Right-of-use assets obtained under operating leases	$ 1	$ 2