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Subsequent Events (Details) - Subsequent Event - FES and FENOC - Discontinued Operations, Disposed of by Means Other than Sale $ in Millions	Apr. 20, 2018 USD ($)
Subsequent Event [Line Items]
Cash payment to settle claims	$ 225
Reversal of NOL	88
Line of Credit | Revolving Credit Facility
Subsequent Event [Line Items]
Face amount of debt	500
Line of Credit | Surety Bond
Subsequent Event [Line Items]
Face amount of debt	200
Promissory Notes
Subsequent Event [Line Items]
Face amount of debt	$ 628

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- Definition

Operating Loss Carryforwards, Reversal

+ References

No definition available.

+ Details

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- Definition

Amount paid to settle bankruptcy claim.

+ References

No definition available.

+ Details

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Details

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- Details

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- Details

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