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Derivative Instruments (Details 3) - Not Designated as Hedging Instrument - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	$ 50	$ 218	$ 161
Purchase Power Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	(17)	(131)	(130)
Other Operating Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Unrealized Gain (Loss) Recognized	(81)	(9)	73
Realized Gain (Loss) Reclassified	(14)	(35)	(49)
Fuel Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	5	(8)	(34)
Commodity contracts | Revenues
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	54	210	111
Commodity contracts | Purchase Power Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	(17)	(131)	(130)
Commodity contracts | Other Operating Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Unrealized Gain (Loss) Recognized	(82)	(14)	93
Realized Gain (Loss) Reclassified	0	0	0
Commodity contracts | Fuel Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	5	(8)	(34)
FTRs | Revenues
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	(4)	8	50
FTRs | Purchase Power Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	0	0	0
FTRs | Other Operating Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Unrealized Gain (Loss) Recognized	1	5	(20)
Realized Gain (Loss) Reclassified	(14)	(35)	(49)
FTRs | Fuel Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	0	0	0
FES | Revenues
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	50	218	160
FES | Purchase Power Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	(17)	(131)	(130)
FES | Other Operating Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Unrealized Gain (Loss) Recognized	(78)	(9)	74
Realized Gain (Loss) Reclassified	(14)	(35)	(49)
FES | Commodity contracts | Revenues
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	54	210	111
FES | Commodity contracts | Purchase Power Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	(17)	(131)	(130)
FES | Commodity contracts | Other Operating Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Unrealized Gain (Loss) Recognized	(79)	(14)	93
Realized Gain (Loss) Reclassified	0	0	0
FES | FTRs | Revenues
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	(4)	8	49
FES | FTRs | Purchase Power Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Realized Gain (Loss) Reclassified	0	0	0
FES | FTRs | Other Operating Expense
Effect of derivative instruments on the statements of income and comprehensive income for instruments not in hedging relationships
Unrealized Gain (Loss) Recognized	1	5	(19)
Realized Gain (Loss) Reclassified	$ (14)	$ (35)	$ (49)

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- Definition

Effect of derivative instruments on statements of income and comprehensive income for instruments designated in cash flow hedging relationships and not in hedging relationships.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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