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Capitalization (Details)	Dec. 31, 2017 $ / shares shares
Preferred stock and preference stock authorizations
Shares Authorized	5,000,000
Par Value, in dollars per share | $ / shares	$ 100
Penn
Preferred stock and preference stock authorizations
Shares Authorized	1,200,000
Par Value, in dollars per share | $ / shares	$ 100
CEI
Preferred stock and preference stock authorizations
Shares Authorized	4,000,000
JCP&L
Preferred stock and preference stock authorizations
Shares Authorized	15,600,000
ME
Preferred stock and preference stock authorizations
Shares Authorized	10,000,000
PN
Preferred stock and preference stock authorizations
Shares Authorized	11,435,000
PE
Preferred stock and preference stock authorizations
Shares Authorized	10,000,000
Par Value, in dollars per share | $ / shares	$ 0.01
WP
Preferred stock and preference stock authorizations
Shares Authorized	32,000,000
Preferred Stock With Par Value $100 | OE
Preferred stock and preference stock authorizations
Shares Authorized	6,000,000
Par Value, in dollars per share | $ / shares	$ 100
Preferred Stock With Par Value $100 | TE
Preferred stock and preference stock authorizations
Shares Authorized	3,000,000
Par Value, in dollars per share | $ / shares	$ 100
Preferred Stock With Par Value $100 | MP
Preferred stock and preference stock authorizations
Shares Authorized	940,000
Par Value, in dollars per share | $ / shares	$ 100
Preferred Stock With Par Value $25 | OE
Preferred stock and preference stock authorizations
Shares Authorized	8,000,000
Par Value, in dollars per share | $ / shares	$ 25
Preferred Stock With Par Value $25 | TE
Preferred stock and preference stock authorizations
Shares Authorized	12,000,000
Par Value, in dollars per share | $ / shares	$ 25
Preference Stock | OE
Preferred stock and preference stock authorizations
Preference Stock Shares Authorized	8,000,000
Preference Stock | CEI
Preferred stock and preference stock authorizations
Preference Stock Shares Authorized	3,000,000
Preference Stock | TE
Preferred stock and preference stock authorizations
Preference Stock Shares Authorized	5,000,000
Preference Stock Par Value, in dollars per share | $ / shares	$ 25

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Preference stock par or stated value per share.

+ References

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- Definition

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- Definition

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+ References

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- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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