Consolidated Statements of Income - SPC - USD ($)	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):
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
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
Southern Power
Operating Revenues:
Total operating revenues	2,198,000,000	2,014,000,000	2,189,000,000
Operating Expenses:
Other operations and maintenance	528,000,000	516,000,000	473,000,000
Depreciation and amortization	843,000,000	522,000,000	504,000,000
Taxes other than income taxes	48,000,000	41,000,000	51,000,000
Gain on dispositions, net	0	0	(20,000,000)
Total operating expenses	2,217,000,000	1,736,000,000	1,830,000,000
Operating Income	(19,000,000)	278,000,000	359,000,000
Other Income and (Expense):
Interest expense, net of amounts capitalized	(104,000,000)	(117,000,000)	(129,000,000)
Other income (expense), net	17,000,000	13,000,000	12,000,000
Total other income and (expense)	(87,000,000)	(104,000,000)	(117,000,000)
Earnings Before Income Taxes	(106,000,000)	174,000,000	242,000,000
Income taxes (benefit)	(61,000,000)	(13,000,000)	12,000,000
Net Income	(45,000,000)	187,000,000	230,000,000
Net loss attributable to noncontrolling interests	(170,000,000)	(141,000,000)	(127,000,000)
Net Income	125,000,000	328,000,000	357,000,000
Southern Power | Wholesale revenues, non-affiliates
Operating Revenues:
Total operating revenues	1,743,000,000	1,606,000,000	1,597,000,000
Southern Power | Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	437,000,000	371,000,000	537,000,000
Southern Power | Other revenues
Operating Revenues:
Total operating revenues	18,000,000	37,000,000	55,000,000
Southern Power | Fuel
Operating Expenses:
Cost of sales	676,000,000	579,000,000	706,000,000
Southern Power | Purchased power
Operating Expenses:
Cost of sales	$ 122,000,000	$ 78,000,000	$ 116,000,000