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Commitments, Guarantees and Contingencies (Details) $ in Millions	Jun. 30, 2016 USD ($)
Guarantor Obligations [Line Items]
Guarantor obligations	$ 379
FES and AE Supply [Member]
Guarantor Obligations [Line Items]
Guarantor obligations	25
FES & AE Supply tied to FES rating [Member]
Guarantor Obligations [Line Items]
Guarantor obligations	310
Utilities
Guarantor Obligations [Line Items]
Guarantor obligations	44
Split Rating
Guarantor Obligations [Line Items]
Guarantor obligations	243
Split Rating | FES and AE Supply [Member]
Guarantor Obligations [Line Items]
Guarantor obligations	25
Split Rating | FES & AE Supply tied to FES rating [Member]
Guarantor Obligations [Line Items]
Guarantor obligations	174
Split Rating | Utilities
Guarantor Obligations [Line Items]
Guarantor obligations	44
Non-Investment Grade Rating
Guarantor Obligations [Line Items]
Guarantor obligations	256
Non-Investment Grade Rating | FES and AE Supply [Member]
Guarantor Obligations [Line Items]
Guarantor obligations	25
Non-Investment Grade Rating | FES & AE Supply tied to FES rating [Member]
Guarantor Obligations [Line Items]
Guarantor obligations	187
Non-Investment Grade Rating | Utilities
Guarantor Obligations [Line Items]
Guarantor obligations	$ 44

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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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=6851643&loc=d3e12069-110248

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- Details

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- Details

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