Condensed Consolidated Balance Sheets (Unaudited) - GAS - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Current Assets:
Cash and cash equivalents	$ 1,264	$ 1,070
Receivables —
Customer accounts	2,301	2,228
Unbilled revenues	895	825
Other accounts and notes	553	597
Accumulated provision for uncollectible accounts	(83)	(74)
Materials and supplies	2,138	2,178
Natural gas for sale	197	388
Prepaid expenses	482	294
Other regulatory assets	732	804
Other current assets	439	476
Total current assets	10,801	10,694
Property, Plant, and Equipment:
In service	140,888	137,143
Less: Accumulated depreciation	41,703	40,126
Plant in service, net of depreciation	99,185	97,017
Construction work in progress	7,686	6,389
Total property, plant, and equipment	108,141	104,689
Other Property and Investments:
Goodwill	5,161	5,161
Equity investments in unconsolidated subsidiaries	1,425	1,416
Other intangible assets, net of amortization	316	332
Miscellaneous property and investments	699	668
Total other property and investments	10,363	10,198
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,405	1,386
Prepaid pension costs	2,881	2,674
Other regulatory assets, deferred	7,338	7,037
Other deferred charges and assets	1,390	1,467
Total deferred charges and other assets	19,548	19,599
Total Assets	148,853	145,180
Current Liabilities:
Securities due within one year	5,365	4,718
Notes payable	988	1,338
Accounts payable —
Customer deposits	468	486
Accrued interest	775	682
Accrued compensation	825	1,261
Natural gas cost over recovery	107	193
Other regulatory liabilities	264	369
Other current liabilities	1,041	1,100
Total current liabilities	14,570	15,993
Long-term Debt	62,983	58,768
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	12,294	11,730
Deferred credits related to income taxes	4,446	4,434
Employee benefit obligations	993	1,011
Operating lease obligations	1,288	1,253
Other cost of removal obligations	2,028	2,016
Other deferred credits and liabilities	1,359	1,350
Total deferred credits and other liabilities	33,958	33,745
Total Liabilities	111,511	108,506
Total Liabilities and Stockholders' Equity	148,853	145,180
SOUTHERN Co GAS
Current Assets:
Cash and cash equivalents	225	43
Receivables —
Customer accounts	327	399
Unbilled revenues	85	244
Other accounts and notes	68	45
Accumulated provision for uncollectible accounts	(50)	(33)
Materials and supplies	62	66
Natural gas for sale	197	388
Prepaid expenses	52	45
Other regulatory assets	151	187
Other current assets	38	55
Total current assets	1,155	1,439
Property, Plant, and Equipment:
In service	23,185	22,338
Less: Accumulated depreciation	6,100	5,887
Plant in service, net of depreciation	17,085	16,451
Construction work in progress	869	1,057
Total property, plant, and equipment	17,954	17,508
Other Property and Investments:
Goodwill	5,015	5,015
Equity investments in unconsolidated subsidiaries	1,300	1,279
Other intangible assets, net of amortization	6	9
Miscellaneous property and investments	24	25
Total other property and investments	6,345	6,328
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	92	38
Prepaid pension costs	202	191
Other regulatory assets, deferred	487	481
Other deferred charges and assets	141	192
Total deferred charges and other assets	922	902
Total Assets	26,376	26,177
Current Liabilities:
Securities due within one year	752	302
Notes payable	471	455
Accounts payable —
Customer deposits	74	98
Accrued taxes	89	85
Accrued interest	88	88
Accrued compensation	85	129
Temporary LIFO liquidation	42	0
Natural gas cost over recovery	107	193
Other regulatory liabilities	43	7
Other current liabilities	137	149
Total current liabilities	2,326	2,018
Long-term Debt	7,786	8,229
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	1,874	1,796
Deferred credits related to income taxes	736	755
Employee benefit obligations	63	78
Operating lease obligations	88	30
Other cost of removal obligations	1,894	1,846
Accrued environmental remediation	187	198
Other deferred credits and liabilities	224	231
Total deferred credits and other liabilities	5,066	4,934
Total Liabilities	15,178	15,181
Total common stockholders' equity	11,198	10,996
Total Liabilities and Stockholders' Equity	26,376	26,177
SOUTHERN Co GAS | Related Party
Accounts payable —
Affiliated and Other	54	75
SOUTHERN Co GAS | Nonrelated Party
Accounts payable —
Affiliated and Other	$ 384	$ 437