Condensed Consolidated Statements of Income (Unaudited) - GAS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Revenues:
Total operating revenues	$ 7,206	$ 5,198	$ 13,854	$ 11,108
Operating Expenses:
Other operations and maintenance	1,558	1,438	3,075	2,810
Depreciation and amortization	913	891	1,805	1,762
Taxes other than income taxes	349	313	721	657
Total operating expenses	5,551	4,490	10,815	8,802
Operating Income	1,655	708	3,039	2,306
Other Income and (Expense):
Earnings (loss) from equity method investments	34	(40)	80	5
Interest expense, net of amounts capitalized	(488)	(450)	(950)	(901)
Other income (expense), net	139	101	283	160
Total other income and (expense)	(262)	(344)	(483)	(646)
Earnings (Loss) Before Income Taxes	1,393	364	2,556	1,660
Income taxes (benefit)	304	(12)	477	178
Consolidated Net Income	1,089	376	2,079	1,482
Retail electric revenues
Operating Revenues:
Total operating revenues	4,789	3,599	8,402	6,941
Wholesale Electric
Operating Revenues:
Total operating revenues	937	546	1,601	1,091
Other electric revenues
Operating Revenues:
Total operating revenues	192	175	370	346
Natural Gas
Operating Revenues:
Total operating revenues	1,083	677	3,140	2,371
Natural gas
Operating Expenses:
Total cost of sales	452	231	1,546	814
Alternative revenue programs
Operating Revenues:
Total operating revenues	2	2	1	4
Other revenues
Operating Revenues:
Total operating revenues	205	201	341	359
Operating Expenses:
Total cost of sales	114	103	183	185
SOUTHERN Co GAS
Operating Revenues:
Total operating revenues	$ 1,083	$ 677	$ 3,140	$ 2,371
Operating Expenses:
Cost, Product and Service [Extensible Enumeration]	Natural gas	Natural gas	Natural gas	Natural gas
Other operations and maintenance	$ 266	$ 233	$ 570	$ 532
Depreciation and amortization	138	133	275	263
Taxes other than income taxes	62	49	163	130
Total operating expenses	918	646	2,554	1,739
Operating Income	165	31	586	632
Other Income and (Expense):
Earnings (loss) from equity method investments	31	(52)	71	(11)
Interest expense, net of amounts capitalized	(61)	(59)	(122)	(118)
Other income (expense), net	16	(14)	32	(78)
Total other income and (expense)	(14)	(125)	(19)	(207)
Earnings (Loss) Before Income Taxes	151	(94)	567	425
Income taxes (benefit)	36	(29)	134	92
Consolidated Net Income	115	(65)	433	333
SOUTHERN Co GAS | Natural gas
Operating Revenues:
Total operating revenues	1,081	675	3,139	2,367
Operating Expenses:
Total cost of sales	452	231	1,546	814
SOUTHERN Co GAS | Alternative revenue programs
Operating Revenues:
Total operating revenues	$ 2	$ 2	$ 1	$ 4