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Commitments, Guarantees and Contingencies (Details) $ in Millions	Dec. 31, 2018 USD ($)
Guarantor Obligations [Line Items]
Potential additional collateral obligations	$ 369
Regulated Distribution
Guarantor Obligations [Line Items]
Potential additional collateral obligations	121
FE
Guarantor Obligations [Line Items]
Potential additional collateral obligations	246
AE Supply
Guarantor Obligations [Line Items]
Potential additional collateral obligations	2
At Current Credit Rating
Guarantor Obligations [Line Items]
Potential additional collateral obligations	1
At Current Credit Rating | Regulated Distribution
Guarantor Obligations [Line Items]
Potential additional collateral obligations	0
At Current Credit Rating | FE
Guarantor Obligations [Line Items]
Potential additional collateral obligations	0
At Current Credit Rating | AE Supply
Guarantor Obligations [Line Items]
Potential additional collateral obligations	1
Upon Further Downgrade
Guarantor Obligations [Line Items]
Potential additional collateral obligations	62
Upon Further Downgrade | Regulated Distribution
Guarantor Obligations [Line Items]
Potential additional collateral obligations	62
Upon Further Downgrade | FE
Guarantor Obligations [Line Items]
Potential additional collateral obligations	0
Upon Further Downgrade | AE Supply
Guarantor Obligations [Line Items]
Potential additional collateral obligations	0
Surety Bond
Guarantor Obligations [Line Items]
Potential additional collateral obligations	306
Surety Bond | Regulated Distribution
Guarantor Obligations [Line Items]
Potential additional collateral obligations	59
Surety Bond | FE
Guarantor Obligations [Line Items]
Potential additional collateral obligations	246
Surety Bond | AE Supply
Guarantor Obligations [Line Items]
Potential additional collateral obligations	$ 1

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+ References

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

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