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Commitments, Guarantees and Contingencies (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Jan. 31, 2017
Guarantor Obligations [Line Items]
Guarantor obligations	$ 412,000,000
At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	8,000,000
Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	42,000,000
Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	$ 362,000,000
Curing period	30 days
Regulated
Guarantor Obligations [Line Items]
Guarantor obligations	$ 147,000,000
Regulated | At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	0
Regulated | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	42,000,000
Regulated | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	105,000,000
FirstEnergy
Guarantor Obligations [Line Items]
Guarantor obligations	185,000,000
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	185,000,000
FES
Guarantor Obligations [Line Items]
Guarantor obligations	54,000,000
FES | At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	6,000,000
FES | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	0
FES | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	48,000,000
FES | Surety Bond (Collateralized Amount) | Little Bull Run | PA DEP
Guarantor Obligations [Line Items]
Amount of surety bond		$ 169,000,000
AE Supply
Guarantor Obligations [Line Items]
Guarantor obligations	26,000,000
AE Supply | At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	2,000,000
AE Supply | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	0
AE Supply | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	$ 24,000,000

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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=82913245&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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