Condensed Consolidated Balance Sheets (Unaudited) - GAS - 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
Other accounts and notes	476	597
Accumulated provision for uncollectible accounts	(79)	(74)
Materials and supplies	2,158	2,178
Natural gas for sale	415	388
Prepaid expenses	324	294
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
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
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
Prepaid pension costs	2,982	2,674
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 —
Customer deposits	489	486
Accrued interest	602	682
Accrued compensation	1,206	1,261
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
Employee benefit obligations	955	1,011
Operating lease obligations	1,242	1,253
Other cost of removal obligations	2,032	2,016
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 Liabilities and Stockholders' Equity	153,248	145,180
SOUTHERN Co GAS
Current Assets:
Cash and cash equivalents	346	43
Receivables —
Customer accounts	223	399
Unbilled revenues	73	244
Other accounts and notes	64	45
Accumulated provision for uncollectible accounts	(44)	(33)
Materials and supplies	59	66
Natural gas for sale	415	388
Prepaid expenses	82	45
Other regulatory assets	177	187
Other current assets	38	55
Total current assets	1,433	1,439
Property, Plant, and Equipment:
In service	23,516	22,338
Less: Accumulated depreciation	6,165	5,887
Plant in service, net of depreciation	17,351	16,451
Construction work in progress	978	1,057
Total property, plant, and equipment	18,329	17,508
Other Property and Investments:
Goodwill	5,015	5,015
Equity investments in unconsolidated subsidiaries	1,175	1,279
Other intangible assets, net of amortization	4	9
Miscellaneous property and investments	25	25
Total other property and investments	6,219	6,328
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	89	38
Prepaid pension costs	208	191
Other regulatory assets, deferred	506	481
Other deferred charges and assets	142	192
Total deferred charges and other assets	945	902
Total Assets	26,926	26,177
Current Liabilities:
Securities due within one year	751	302
Notes payable	144	455
Accounts payable —
Customer deposits	91	98
Accrued taxes	76	85
Accrued interest	77	88
Accrued compensation	119	129
Natural gas cost over recovery	163	193
Other regulatory liabilities	30	7
Other current liabilities	133	149
Total current liabilities	2,061	2,018
Long-term Debt	8,579	8,229
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	1,992	1,796
Deferred credits related to income taxes	728	755
Employee benefit obligations	60	78
Operating lease obligations	88	30
Other cost of removal obligations	1,908	1,846
Accrued environmental remediation	203	198
Other deferred credits and liabilities	218	231
Total deferred credits and other liabilities	5,197	4,934
Total Liabilities	15,837	15,181
Total common stockholders' equity	11,089	10,996
Total Liabilities and Stockholders' Equity	26,926	26,177
SOUTHERN Co GAS | Related Party
Accounts payable —
Affiliated and Other	58	75
SOUTHERN Co GAS | Nonrelated Party
Accounts payable —
Affiliated and Other	$ 419	$ 437