Condensed Consolidated Balance Sheets (Unaudited) - GAS - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 1,676	$ 1,917
Receivables —
Customer accounts	2,230	2,128
Unbilled revenues	547	1,012
Other accounts and notes	553	637
Accumulated provision for uncollectible accounts	(78)	(71)
Natural gas for sale	406	438
Prepaid expenses	321	347
Other regulatory assets	996	968
Other current assets	544	344
Total current assets	11,088	10,416
Property, Plant, and Equipment:
In service	125,573	117,529
Less: Accumulated depreciation	37,199	35,297
Plant in service, net of depreciation	88,374	82,232
Construction work in progress	8,496	10,896
Total property, plant, and equipment	98,254	94,570
Other Property and Investments:
Goodwill	5,161	5,161
Equity investments in unconsolidated subsidiaries	1,376	1,443
Other intangible assets, net of amortization	377	406
Miscellaneous property and investments	651	602
Total other property and investments	9,772	9,757
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,467	1,531
Prepaid pension costs	2,574	2,290
Other regulatory assets, deferred	5,666	5,918
Other deferred charges and assets	1,479	1,485
Total deferred charges and other assets	19,207	20,148
Total Assets	138,321	134,891
Current Liabilities:
Securities due within one year	3,076	4,285
Notes payable	1,726	2,609
Accounts payable —
Customer deposits	511	502
Accrued interest	573	614
Accrued compensation	936	1,127
Natural gas cost over recovery	165	0
Other regulatory liabilities	163	382
Other current liabilities	943	787
Total current liabilities	13,214	15,724
Long-term Debt	56,003	50,656
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	10,774	10,036
Deferred credits related to income taxes	4,813	5,235
Employee benefit obligations	1,184	1,238
Operating lease obligations	1,320	1,388
Other cost of removal obligations	1,940	1,903
Other deferred credits and liabilities	1,166	1,167
Total deferred credits and other liabilities	33,800	33,979
Total Liabilities	103,017	100,359
Total Stockholders' Equity	35,304	34,532
Total Liabilities and Stockholders' Equity	138,321	134,891
SOUTHERN Co GAS
Current Assets:
Cash and cash equivalents	397	81
Receivables —
Customer accounts	242	616
Unbilled revenues	74	453
Other accounts and notes	52	76
Accumulated provision for uncollectible accounts	(53)	(50)
Natural gas for sale	406	438
Prepaid expenses	92	93
Natural gas cost under recovery	0	108
Other regulatory assets	144	119
Other current assets	108	104
Total current assets	1,462	2,038
Property, Plant, and Equipment:
In service	20,459	19,723
Less: Accumulated depreciation	5,454	5,276
Plant in service, net of depreciation	15,005	14,447
Construction work in progress	1,158	909
Total property, plant, and equipment	16,163	15,356
Other Property and Investments:
Goodwill	5,015	5,015
Equity investments in unconsolidated subsidiaries	1,243	1,276
Other intangible assets, net of amortization	19	26
Miscellaneous property and investments	24	28
Total other property and investments	6,301	6,345
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	47	57
Prepaid pension costs	205	183
Other regulatory assets, deferred	483	497
Other deferred charges and assets	162	145
Total deferred charges and other assets	897	882
Total Assets	24,823	24,621
Current Liabilities:
Securities due within one year	400	400
Notes payable	75	768
Accounts payable —
Customer deposits	133	125
Accrued taxes	75	77
Accrued interest	79	67
Accrued compensation	85	105
Natural gas cost over recovery	165	0
Other regulatory liabilities	44	36
Other current liabilities	146	187
Total current liabilities	1,638	2,570
Long-term Debt	7,657	7,042
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	1,629	1,560
Deferred credits related to income taxes	766	788
Employee benefit obligations	108	120
Operating lease obligations	40	51
Other cost of removal obligations	1,748	1,707
Accrued environmental remediation	202	207
Other deferred credits and liabilities	202	179
Total deferred credits and other liabilities	4,695	4,612
Total Liabilities	13,990	14,224
Total Stockholders' Equity	10,833	10,397
Total Liabilities and Stockholders' Equity	24,823	24,621
SOUTHERN Co GAS | Related Party
Accounts payable —
Affiliated and Other	62	104
SOUTHERN Co GAS | Nonrelated Party
Accounts payable —
Affiliated and Other	$ 374	$ 701