Condensed Consolidated Statements of Income (Unaudited) - Southern - USD ($) shares in Millions, $ 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):
Allowance for equity funds used during construction	90	58	243	167
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	1,707	1,535	3,830	3,794
Net loss attributable to noncontrolling interests	(4)	0	(95)	(73)
Consolidated Net Income Attributable to Southern Company	$ 1,711	$ 1,535	$ 3,925	$ 3,867
Earnings per share -
Basic (in dollars per share)	$ 1.55	$ 1.40	$ 3.56	$ 3.53
Diluted (in dollars per share)	$ 1.54	$ 1.39	$ 3.54	$ 3.51
Average number of shares of common stock outstanding — (in millions)
Basic (in shares)	1,102	1,097	1,101	1,096
Diluted (in shares)	1,110	1,103	1,108	1,102
Retail electric revenues
Operating Revenues:
Total operating revenues	$ 5,707	$ 5,366	$ 15,065	$ 13,793
Wholesale electric revenues
Operating Revenues:
Total operating revenues	832	721	2,257	1,919
Other electric revenues
Operating Revenues:
Total operating revenues	262	222	724	631
Natural Gas
Operating Revenues:
Total operating revenues	734	682	3,552	3,220
Other revenues
Operating Revenues:
Total operating revenues	288	283	974	820
Operating Expenses:
Total cost of sales	156	166	522	464
Fuel
Operating Expenses:
Total cost of sales	1,345	1,146	3,753	3,174
Purchased power
Operating Expenses:
Total cost of sales	259	249	769	669
Natural gas
Operating Expenses:
Total cost of sales	116	98	1,046	852
Alternative revenue programs
Operating Revenues:
Total operating revenues	$ (5)	$ 1	$ (32)	$ 46

Condensed Consolidated Statements of Cash Flows (Unaudited) - Southern - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Operating Activities:
Consolidated Net Income	$ 3,830	$ 3,794
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	4,425	3,916
Deferred income taxes	355	607
Allowance for equity funds used during construction	(243)	(167)
Pension, postretirement, and other employee benefits	(414)	(391)
Settlement of asset retirement obligations	(471)	(405)
Stock based compensation expense	124	120
Storm damage cost recovery – long-term	(262)	0
Other, net	(22)	(121)
Changes in certain current assets and liabilities —
Receivables	200	(233)
Retail fuel cost under recovery	439	843
Fossil fuel stock	121	143
Materials and supplies	18	(195)
Other current assets	(187)	(181)
Accounts payable	(747)	(161)
Accrued taxes	432	179
Accrued compensation	(126)	(90)
Other current liabilities	(267)	(43)
Net cash provided from operating activities	7,205	7,615
Investing Activities:
Property additions	(8,452)	(6,206)
Business acquisition	(635)	0
Nuclear decommissioning trust fund purchases	(1,212)	(1,070)
Nuclear decommissioning trust fund sales	1,212	1,070
Proceeds from dispositions	1	370
Cost of removal, net of salvage	(479)	(444)
Change in construction payables, net	69	(119)
Other investing activities	(103)	(279)
Net cash used for investing activities	(9,599)	(6,678)
Financing Activities:
Increase (decrease) in notes payable, net	(993)	(1,264)
Proceeds —
Long-term debt	10,269	5,321
Short-term borrowings	200	700
Common stock	90	112
Redemptions and repurchases —
Long-term debt	(2,383)	(2,167)
Short-term borrowings	0	(1,020)
Distributions to noncontrolling interests	(118)	(108)
Payment of common stock dividends	(2,254)	(2,220)
Other financing activities	(176)	(157)
Net cash provided from (used for) financing activities	4,635	(803)
Net Change in Cash, Cash Equivalents, and Restricted Cash	2,241	134
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,101	921
Cash, Cash Equivalents, and Restricted Cash at End of Period	3,342	1,055
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	2,173	2,015
Income taxes, net (excludes credit transfers)	231	131
Noncash transactions —
Accrued property additions at end of period	1,177	937
Right-of-use assets obtained under operating leases	131	126
Right-of-use assets obtained under finance leases	17	1
Reassessment of right-of-use assets under operating leases	0	(7)
Issuance of common stock under dividend reinvestment plan	$ 167	$ 123

Condensed Consolidated Balance Sheets (Unaudited) - Southern - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Current Assets:
Cash and cash equivalents	$ 3,341	$ 1,070
Receivables —
Customer accounts	2,304	2,228
Unbilled revenues	685	825
Under recovered fuel clause revenues	517	713
Other accounts and notes	476	597
Accumulated provision for uncollectible accounts	(79)	(74)
Materials and supplies	2,158	2,178
Fossil fuel for generation	682	803
Natural gas for sale	415	388
Prepaid expenses	324	294
Assets from risk management activities, net of collateral	56	39
Regulatory assets – asset retirement obligations	353	353
Other regulatory assets	793	804
Other current assets	602	476
Total current assets	12,627	10,694
Property, Plant, and Equipment:
In service	143,189	137,143
Less: Accumulated depreciation	42,793	40,126
Plant in service, net of depreciation	100,396	97,017
Other utility plant, net	331	410
Nuclear fuel, at amortized cost	914	873
Construction work in progress	9,239	6,389
Total property, plant, and equipment	110,880	104,689
Other Property and Investments:
Goodwill	5,161	5,161
Nuclear decommissioning trusts, at fair value	2,884	2,621
Equity investments in unconsolidated subsidiaries	1,303	1,416
Other intangible assets, net of amortization	308	332
Miscellaneous property and investments	696	668
Total other property and investments	10,352	10,198
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,378	1,386
Deferred charges related to income taxes	911	889
Prepaid pension costs	2,982	2,674
Unamortized loss on reacquired debt	191	203
Deferred under recovered fuel clause revenues	197	485
Regulatory assets – asset retirement obligations, deferred	5,047	5,458
Other regulatory assets, deferred	7,361	7,037
Other deferred charges and assets	1,322	1,467
Total deferred charges and other assets	19,389	19,599
Total Assets	153,248	145,180
Current Liabilities:
Securities due within one year	7,541	4,718
Notes payable	144	1,338
Accounts payable	3,017	3,701
Customer deposits	489	486
Accrued taxes —
Accrued income taxes	456	57
Other accrued taxes	966	997
Accrued interest	602	682
Accrued compensation	1,206	1,261
Asset retirement obligations	680	731
Liabilities from risk management activities, net of collateral	98	160
Operating lease obligations	198	200
Natural gas cost over recovery	163	193
Other regulatory liabilities	196	369
Other current liabilities	970	1,100
Total current liabilities	16,726	15,993
Long-term Debt	64,621	58,768
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	12,250	11,730
Deferred credits related to income taxes	4,381	4,434
Accumulated deferred ITCs	1,994	2,056
Employee benefit obligations	955	1,011
Operating lease obligations, deferred	1,242	1,253
Asset retirement obligations, deferred	8,774	9,203
Other cost of removal obligations	2,032	2,016
Other regulatory liabilities, deferred	642	692
Other deferred credits and liabilities	1,357	1,350
Total deferred credits and other liabilities	33,627	33,745
Total Liabilities	114,974	108,506
Total Stockholders' Equity	38,274	36,674
Total Liabilities and Stockholders' Equity	$ 153,248	$ 145,180