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Derivative Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair value of derivatives instruments
Derivative Assets	$ 54	$ 218
Derivative Liabilities	(119)	(238)
Current Assets - Derivatives
Fair value of derivatives instruments
Derivative Assets	45	140
Deferred Charges and Other Assets - Other
Fair value of derivatives instruments
Derivative Assets	9	78
Current Liabilities - Derivatives
Fair value of derivatives instruments
Derivative Liabilities	(18)	(78)
Noncurrent Liabilities
Fair value of derivatives instruments
Derivative Liabilities	(101)	(160)
Commodity contracts | Current Assets - Derivatives
Fair value of derivatives instruments
Derivative Assets	41	133
Commodity contracts | Deferred Charges and Other Assets - Other
Fair value of derivatives instruments
Derivative Assets	9	77
Commodity contracts | Current Liabilities - Derivatives
Fair value of derivatives instruments
Derivative Liabilities	(16)	(72)
Commodity contracts | Noncurrent Liabilities
Fair value of derivatives instruments
Derivative Liabilities	(2)	(52)
FTRs | Current Assets - Derivatives
Fair value of derivatives instruments
Derivative Assets	4	7
FTRs | Current Liabilities - Derivatives
Fair value of derivatives instruments
Derivative Liabilities	(2)	(6)
NUGs | Deferred Charges and Other Assets - Other
Fair value of derivatives instruments
Derivative Assets	0	1
NUGs | Noncurrent Liabilities
Fair value of derivatives instruments
Derivative Liabilities	(99)	(108)
FES
Fair value of derivatives instruments
Derivative Assets	50	214
Derivative Liabilities	(19)	(129)
FES | Current Assets - Derivatives
Fair value of derivatives instruments
Derivative Assets	41	137
FES | Deferred Charges and Other Assets - Other
Fair value of derivatives instruments
Derivative Assets	9	77
FES | Current Liabilities - Derivatives
Fair value of derivatives instruments
Derivative Liabilities	(18)	(77)
FES | Noncurrent Liabilities
Fair value of derivatives instruments
Derivative Liabilities	(1)	(52)
FES | Commodity contracts | Current Assets - Derivatives
Fair value of derivatives instruments
Derivative Assets	40	133
FES | Commodity contracts | Deferred Charges and Other Assets - Other
Fair value of derivatives instruments
Derivative Assets	9	77
FES | Commodity contracts | Current Liabilities - Derivatives
Fair value of derivatives instruments
Derivative Liabilities	(16)	(72)
FES | Commodity contracts | Noncurrent Liabilities
Fair value of derivatives instruments
Derivative Liabilities	(1)	(52)
FES | FTRs | Current Assets - Derivatives
Fair value of derivatives instruments
Derivative Assets	1	4
FES | FTRs | Current Liabilities - Derivatives
Fair value of derivatives instruments
Derivative Liabilities	$ (2)	$ (5)

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

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