REGULATORY MATTERS - GPC Tariffs (Details) - Georgia Power - USD ($) $ in Millions	Dec. 20, 2022	Dec. 31, 2019
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	377	$ 111
Requested rate increase (decrease), amount, due in 2025	403	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	120
Requested rate increase (decrease), amount, due in 2025	315	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	66	2
Requested rate increase (decrease), amount, due in 2025	81	(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	27	(15)
Requested rate increase (decrease), amount, due in 2025	(2)	(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	9	4
Requested rate increase (decrease), amount, due in 2025	$ 9	$ 2