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Commitments, Guarantees and Contingencies (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Guarantor Obligations [Line Items]
Guarantor obligations	$ 393
Curing period	30 days
At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	$ 1
Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	46
Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	346
Regulated
Guarantor Obligations [Line Items]
Guarantor obligations	155
Regulated | At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	0
Regulated | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	46
Regulated | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	109
FirstEnergy
Guarantor Obligations [Line Items]
Guarantor obligations	236
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	236
AE Supply
Guarantor Obligations [Line Items]
Guarantor obligations	2
AE Supply | At Current Credit Rating
Guarantor Obligations [Line Items]
Guarantor obligations	1
AE Supply | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	0
AE Supply | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	$ 1

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Guarantor Obligations, Curing Period

+ References

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+ References

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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=82913245&loc=d3e12069-110248

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