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Regulated Operating Revenue, Refund Payments, Net

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Regulatory matters.

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Utilities Capital Assets Reclassified Into Earnings

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Utilities Reduction in Operating Expense

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Discloses the amount of any reduction to the carrying amounts of regulated assets that result from impairment (for example, rate actions of a regulator).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Percentage of public utility's approved debt to capital, including debt and equity.

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Percentage of public utility's approved equity to capital, including debt and equity.

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Amount of operating expense of regulated operation.

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REGULATORY MATTERS - Reliability and FERC Matters (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2022	Sep. 30, 2021
FERC \| FE \| Transmission Related Vegetation Management Programs
Regulatory Matters [Line Items]
Refund payments	$ 45
Refund payments, net	34
Capital assets reclassified into earnings	195
Utilities operating expense	90
Utilities operating expense, net	67
Utilities reduction in operating expense	$ 160
FERC \| FE \| Other Nonoperating Income (Expense) \| Transmission Related Vegetation Management Programs
Regulatory Matters [Line Items]
Pre-tax impairment of regulatory asset			$ 21
Regulated Transmission
Regulatory Matters [Line Items]
Approved ROE		10.45%
Approved capital structure		56.00%
Regulated Transmission \| FERC
Regulatory Matters [Line Items]
Pre-tax impairment of regulatory asset		$ 25
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%
Approved capital structure		51.40%
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%
Approved capital structure		46.00%
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%
Approved capital structure		50.30%
WP \| Regulated Transmission
Regulatory Matters [Line Items]
Approved ROE		11.35%