Condensed Consolidated Statements of Cash Flows (Unaudited) - GAS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating Activities:
Net income	$ 3,794	$ 3,053
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	3,916	3,699
Deferred income taxes	520	(52)
Other, net	(100)	(26)
Changes in certain current assets and liabilities —
Receivables	(233)	524
Natural gas cost under recovery	0	108
Other current assets	(181)	(32)
Accounts payable	(161)	(1,031)
Other current liabilities	(27)	66
Net cash provided from operating activities	7,615	5,740
Investing Activities:
Property additions	(6,206)	(6,561)
Cost of removal, net of salvage	(444)	(421)
Change in construction payables, net	(119)	241
Other investing activities	(279)	(139)
Net cash used for investing activities	(6,678)	(6,721)
Financing Activities:
Decrease in notes payable, net	(1,264)	(298)
Proceeds —
Redemptions — Short-term borrowings	(1,020)	(850)
Payment of common stock dividends	(2,220)	(2,271)
Other financing activities	(157)	(120)
Net cash provided from (used for) financing activities	(803)	834
Net Change in Cash, Cash Equivalents, and Restricted Cash	134	(147)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	921	2,037
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,055	1,890
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	2,015	1,694
Income taxes, net	131	11
Noncash transactions —
Accrued property additions at end of period	937	1,224
Right-of-use assets obtained under operating leases	126	76
SOUTHERN Co GAS
Operating Activities:
Net income	555	475
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	466	429
Deferred income taxes	206	75
Other, net	7	(15)
Changes in certain current assets and liabilities —
Receivables	386	776
Natural gas for sale, net of temporary LIFO liquidation	3	31
Natural gas cost under recovery	0	108
Other current assets	(57)	(20)
Accounts payable	(105)	(346)
Natural gas cost over recovery	12	165
Other current liabilities	(66)	(34)
Net cash provided from operating activities	1,407	1,644
Investing Activities:
Property additions	(1,064)	(1,151)
Cost of removal, net of salvage	(63)	(82)
Change in construction payables, net	(13)	(38)
Other investing activities	(56)	45
Net cash used for investing activities	(1,196)	(1,226)
Financing Activities:
Decrease in notes payable, net	(352)	(493)
Proceeds —
Senior notes	450	500
First mortgage bonds	156	125
Other long-term debt	9	29
Redemptions — Short-term borrowings	0	(200)
Capital contributions from parent company	0	377
Payment of common stock dividends	(454)	(439)
Other financing activities	(10)	(1)
Net cash provided from (used for) financing activities	(201)	(102)
Net Change in Cash, Cash Equivalents, and Restricted Cash	10	316
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	35	83
Cash, Cash Equivalents, and Restricted Cash at End of Period	45	399
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	258	214
Income taxes, net	(54)	70
Noncash transactions —
Accrued property additions at end of period	126	139
Right-of-use assets obtained under operating leases	$ 1	$ 3