REGULATORY MATTERS - GPC Tariffs (Details) - Georgia Power $ in Millions	Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	$ 216
Requested rate increase (decrease), amount, due in 2024	191
Requested rate increase (decrease), amount, due in 2025	157
Traditional base
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	194
Requested rate increase (decrease), amount, due in 2024	275
Requested rate increase (decrease), amount, due in 2025	192
ECCR
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	(21)
Requested rate increase (decrease), amount, due in 2024	(99)
Requested rate increase (decrease), amount, due in 2025	(12)
DSM
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	37
Requested rate increase (decrease), amount, due in 2024	10
Requested rate increase (decrease), amount, due in 2025	(25)
MFF
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	6
Requested rate increase (decrease), amount, due in 2024	5
Requested rate increase (decrease), amount, due in 2025	$ 2