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REGULATORY MATTERS - Reliability and FERC Matters (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
FERC | FE | Other Nonoperating Income (Expense) | Transmission Related Vegetation Management Programs
Regulatory Matters [Line Items]
Pre-tax impairment of regulatory asset	$ 21
ATSI | Regulated Transmission
Regulatory Matters [Line Items]
Approved ROE	10.38%
ATSI | Regulated Transmission | FERC | Transmission Related Vegetation Management Programs
Regulatory Matters [Line Items]
Pre-tax impairment of regulatory asset	$ 48
ATSI | Regulated Distribution | FERC | Transmission Related Vegetation Management Programs
Regulatory Matters [Line Items]
Pre-tax impairment of regulatory asset	$ 27
JCP&L
Regulatory Matters [Line Items]
Allowed Debt	48.60%
Approved ROE	9.60%
JCP&L | Regulated Transmission
Regulatory Matters [Line Items]
Approved ROE	10.20%
MAIT | Regulated Transmission
Regulatory Matters [Line Items]
Allowed Debt	60.00%
Approved ROE	10.30%
TrAIL | Regulated Transmission | TrAIL the Line and Black Oak SVC
Regulatory Matters [Line Items]
Approved ROE	12.70%
TrAIL | Regulated Transmission | All Other Projects
Regulatory Matters [Line Items]
Approved ROE	11.70%
MP
Regulatory Matters [Line Items]
Allowed Debt	54.00%
MP | Regulated Transmission
Regulatory Matters [Line Items]
Approved ROE	11.35%
PE | Regulated Transmission
Regulatory Matters [Line Items]
Approved ROE	11.35%
WP
Regulatory Matters [Line Items]
Allowed Debt	49.70%
WP | Regulated Transmission
Regulatory Matters [Line Items]
Approved ROE	11.35%

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Regulatory matters.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6066304&loc=d3e44026-110379

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