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Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair value of derivatives
Derivative Assets	$ 37	$ 218
Derivative Liabilities	(107)	(238)
Current Assets
Fair value of derivatives
Derivative Assets	37	140
Deferred Charges and Other Assets
Fair value of derivatives
Derivative Assets	0	78
Current Liabilities
Fair value of derivatives
Derivative Liabilities	(28)	(78)
Noncurrent Liabilities
Fair value of derivatives
Derivative Liabilities	(79)	(160)
Commodity contracts | Current Assets
Fair value of derivatives
Derivative Assets	33	133
Commodity contracts | Deferred Charges and Other Assets
Fair value of derivatives
Derivative Assets	0	77
Commodity contracts | Current Liabilities
Fair value of derivatives
Derivative Liabilities	(27)	(72)
Commodity contracts | Noncurrent Liabilities
Fair value of derivatives
Derivative Liabilities	0	(52)
FTRs | Current Assets
Fair value of derivatives
Derivative Assets	4	7
FTRs | Deferred Charges and Other Assets
Fair value of derivatives
Derivative Assets	0	0
FTRs | Current Liabilities
Fair value of derivatives
Derivative Liabilities	(1)	(6)
FTRs | Noncurrent Liabilities
Fair value of derivatives
Derivative Liabilities	0	0
NUGs | Deferred Charges and Other Assets
Fair value of derivatives
Derivative Assets	0	1
NUGs | Noncurrent Liabilities
Fair value of derivatives
Derivative Liabilities	(79)	(108)
FES
Fair value of derivatives
Derivative Assets	34	214
Derivative Liabilities	(24)	(129)
FES | Current Assets
Fair value of derivatives
Derivative Assets	34	137
FES | Deferred Charges and Other Assets
Fair value of derivatives
Derivative Assets	0	77
FES | Current Liabilities
Fair value of derivatives
Derivative Liabilities	(24)	(77)
FES | Noncurrent Liabilities
Fair value of derivatives
Derivative Liabilities	0	(52)
FES | Commodity contracts | Current Assets
Fair value of derivatives
Derivative Assets	33	133
FES | Commodity contracts | Deferred Charges and Other Assets
Fair value of derivatives
Derivative Assets	0	77
FES | Commodity contracts | Current Liabilities
Fair value of derivatives
Derivative Liabilities	(23)	(72)
FES | Commodity contracts | Noncurrent Liabilities
Fair value of derivatives
Derivative Liabilities	0	(52)
FES | FTRs | Current Assets
Fair value of derivatives
Derivative Assets	1	4
FES | FTRs | Current Liabilities
Fair value of derivatives
Derivative Liabilities	$ (1)	$ (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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