Condensed Consolidated Statements of Income (Unaudited) - GAS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Operating Revenues:
Total operating revenues	$ 7,823	$ 7,274	$ 22,572	$ 20,383
Operating Expenses:
Other operations and maintenance	1,643	1,662	4,948	4,522
Depreciation and amortization	1,422	1,210	4,030	3,537
Taxes other than income taxes	288	375	1,136	1,155
Total operating expenses	5,229	4,906	16,204	14,373
Operating Income	2,594	2,368	6,368	6,010
Other Income and (Expense):
Earnings from equity method investments	33	31	76	107
Interest expense, net of amounts capitalized	(755)	(692)	(2,343)	(2,050)
Other income (expense), net	149	147	459	450
Total other income and (expense)	(483)	(456)	(1,565)	(1,326)
Earnings Before Income Taxes	2,111	1,912	4,803	4,684
Income taxes	404	377	973	890
Consolidated Net Income Attributable to Southern Company	1,711	1,535	3,925	3,867
SOUTHERN Co GAS
Operating Revenues:
Total operating revenues	$ 734	$ 682	$ 3,552	$ 3,220
Revenue, Product and Service [Extensible Enumeration]	Natural gas	Natural gas	Natural gas	Natural gas
Operating Expenses:
Cost, Product and Service [Extensible Enumeration]	Natural gas	Natural gas	Natural gas	Natural gas
Total cost of sales	$ 116	$ 98	$ 1,046	$ 852
Other operations and maintenance	314	295	929	877
Depreciation and amortization	176	162	517	475
Taxes other than income taxes	48	44	206	186
Total operating expenses	654	599	2,698	2,390
Operating Income	80	83	854	830
Other Income and (Expense):
Earnings from equity method investments	31	34	93	110
Interest expense, net of amounts capitalized	(94)	(84)	(277)	(250)
Other income (expense), net	14	16	48	49
Total other income and (expense)	(49)	(34)	(136)	(91)
Earnings Before Income Taxes	31	49	718	739
Income taxes	6	11	169	184
Consolidated Net Income Attributable to Southern Company	$ 25	$ 38	$ 549	$ 555