Regulatory Matters - GPC Tariffs (Details) - GEORGIA POWER CO $ in Millions	Jun. 24, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	$ 852
Requested rate increase (decrease), amount, due in 2024	107
Requested rate increase (decrease), amount, due in 2025	45
Traditional base
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	739
Requested rate increase (decrease), amount, due in 2024	0
Requested rate increase (decrease), amount, due in 2025	0
Traditional
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	(1)
Requested rate increase (decrease), amount, due in 2024	0
Requested rate increase (decrease), amount, due in 2025	0
CCR ARO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	64
Requested rate increase (decrease), amount, due in 2024	78
Requested rate increase (decrease), amount, due in 2025	47
DSM
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	30
Requested rate increase (decrease), amount, due in 2024	27
Requested rate increase (decrease), amount, due in 2025	(2)
Municipal Franchise Fee
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	20
Requested rate increase (decrease), amount, due in 2024	2
Requested rate increase (decrease), amount, due in 2025	$ 1