Consolidated Statements of Income - Southern - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Revenues:
Total operating revenues	$ 29,553,000,000	$ 26,724,000,000	$ 25,253,000,000
Operating Expenses:
Other operations and maintenance	7,066,000,000	6,518,000,000	6,025,000,000
Depreciation and amortization	5,501,000,000	4,755,000,000	4,525,000,000
Taxes other than income taxes	1,538,000,000	1,540,000,000	1,425,000,000
Total operating expenses	22,268,000,000	19,656,000,000	19,427,000,000
Operating Income	7,285,000,000	7,068,000,000	5,826,000,000
Other Income and (Expense):
Allowance for equity funds used during construction	340,000,000	235,000,000	268,000,000
Earnings from equity method investments	112,000,000	139,000,000	144,000,000
Interest expense, net of amounts capitalized	(3,238,000,000)	(2,743,000,000)	(2,446,000,000)
Other income (expense), net	500,000,000	530,000,000	553,000,000
Total other income and (expense)	(2,286,000,000)	(1,839,000,000)	(1,481,000,000)
Earnings Before Income Taxes	4,999,000,000	5,229,000,000	4,345,000,000
Income taxes (benefit)	828,000,000	969,000,000	496,000,000
Net Income	4,171,000,000	4,260,000,000	3,849,000,000
Net loss attributable to noncontrolling interests	(170,000,000)	(141,000,000)	(127,000,000)
Net Income	$ 4,341,000,000	$ 4,401,000,000	$ 3,976,000,000
Earnings per share —
Basic (in dollars per share)	$ 3.94	$ 4.02	$ 3.64
Diluted (in dollars per share)	$ 3.92	$ 3.99	$ 3.62
Average number of shares of common stock outstanding — (in millions)
Basic (in shares)	1,103	1,096	1,092
Diluted (in shares)	1,109	1,102	1,098
Retail electric revenues
Operating Revenues:
Total operating revenues	$ 19,331,000,000	$ 17,790,000,000	$ 16,343,000,000
Wholesale electric revenues
Operating Revenues:
Total operating revenues	2,941,000,000	2,431,000,000	2,467,000,000
Other electric revenues
Operating Revenues:
Total operating revenues	953,000,000	896,000,000	792,000,000
Natural gas revenues
Operating Revenues:
Total operating revenues	5,044,000,000	4,456,000,000	4,702,000,000
Other revenues
Operating Revenues:
Total operating revenues	1,284,000,000	1,151,000,000	949,000,000
Operating Expenses:
Cost of sales	687,000,000	668,000,000	560,000,000
Fuel
Operating Expenses:
Cost of sales	4,897,000,000	4,096,000,000	4,365,000,000
Purchased power
Operating Expenses:
Cost of sales	980,000,000	883,000,000	883,000,000
Natural gas
Operating Expenses:
Cost of sales	$ 1,599,000,000	$ 1,196,000,000	$ 1,644,000,000