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Commitments, Guarantees and Contingencies - Potential Collateral Obligations (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Guarantor Obligations [Line Items]
Guarantor obligations	$ 353
Curing period	30 days
Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	$ 33
Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	320
Utilities and FET
Guarantor Obligations [Line Items]
Guarantor obligations	96
Utilities and FET | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	33
Utilities and FET | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	63
FirstEnergy
Guarantor Obligations [Line Items]
Guarantor obligations	257
FirstEnergy | Upon Further Downgrade
Guarantor Obligations [Line Items]
Guarantor obligations	0
FirstEnergy | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Guarantor obligations	$ 257

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- Definition

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://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=118943654&loc=d3e12069-110248

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