Financing - DOE Loan Guarantee Borrowings (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended
	Feb. 20, 2026	Mar. 31, 2026	Mar. 31, 2026
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 8,920	$ 8,920
GEORGIA POWER CO
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 2,050	$ 2,050
GEORGIA POWER CO | FFB Credit Facility
Line of Credit Facility [Line Items]
Borrower reimbursement, maximum percentage of eligible project costs	80.00%
Line of credit facility, maximum borrowing capacity	$ 22,400
Interest rate		5.041%	5.041%
Debt Instrument, Basis Spread on Variable Rate			0.375%
Prepayment requirement, percentage of total advances made to borrower, minimum threshold	95.00%
Mandatory prepayment, percentage of principal to be prepaid	100.00%
Proceeds from Lines of Credit		$ 1,000
GEORGIA POWER CO | FFB Credit Facility | Minimum
Line of Credit Facility [Line Items]
Mandatory prepayment, payable period	1 year
GEORGIA POWER CO | FFB Credit Facility | Maximum
Line of Credit Facility [Line Items]
Mandatory prepayment, payable period	5 years
ALABAMA POWER CO
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,365	$ 1,365
ALABAMA POWER CO | FFB Credit Facility
Line of Credit Facility [Line Items]
Borrower reimbursement, maximum percentage of eligible project costs	80.00%
Line of credit facility, maximum borrowing capacity	$ 4,100
Debt Instrument, Basis Spread on Variable Rate			0.375%
Prepayment requirement, percentage of total advances made to borrower, minimum threshold	95.00%
Mandatory prepayment, percentage of principal to be prepaid	100.00%
ALABAMA POWER CO | FFB Credit Facility | Minimum
Line of Credit Facility [Line Items]
Mandatory prepayment, payable period	1 year
ALABAMA POWER CO | FFB Credit Facility | Maximum
Line of Credit Facility [Line Items]
Mandatory prepayment, payable period	3 years