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Commitments, Guarantees and Contingencies (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Jan. 31, 2017
Guarantor Obligations [Line Items]
Guarantor obligations	$ 419,000,000
At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	11,000,000
Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	50,000,000
Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	$ 358,000,000
Curing period	30 days
Regulated
Guarantor Obligations [Line Items]
Guarantor obligations	$ 143,000,000
Regulated | At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	0
Regulated | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	50,000,000
Regulated | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	93,000,000
FirstEnergy
Guarantor Obligations [Line Items]
Guarantor obligations	7,000,000
FirstEnergy | At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	0
FirstEnergy | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	0
FirstEnergy | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	7,000,000
FES
Guarantor Obligations [Line Items]
Guarantor obligations	241,000,000
FES | At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	8,000,000
FES | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	0
FES | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	233,000,000
FES | Surety Bond (Collateralized Amount) | Little Bull Run [Member]
Guarantor Obligations [Line Items]
Amount of surety bond		$ 169,000,000
AE Supply
Guarantor Obligations [Line Items]
Guarantor obligations	28,000,000
AE Supply | At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	3,000,000
AE Supply | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	0
AE Supply | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	$ 25,000,000

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Guarantor Obligations, Curing Period

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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