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Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Assets
Fair value, assets	$ 3,159	$ 2,876
Liabilities
Fair value, liabilities	(272)	(281)
Net assets (liabilities)	2,887	2,595
FES
Assets
Fair value, assets	1,744	1,559
Liabilities
Fair value, liabilities	(145)	(142)
Net assets (liabilities)	1,599	1,417
Commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(140)	(131)
Commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(140)	(131)
FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	(8)	(13)
FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(5)	(11)
NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(124)	(137)
Corporate debt securities
Assets
Fair value, assets	1,206	1,245
Corporate debt securities | FES
Assets
Fair value, assets	698	678
Commodity contracts | Derivative Assets
Assets
Fair value, assets	226	228
Commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	226	228
FTRs | Derivative Assets
Assets
Fair value, assets	17	8
FTRs | Derivative Assets | FES
Assets
Fair value, assets	12	5
NUG contracts | Derivative Assets
Assets
Fair value, assets	1	1
Equity securities
Assets
Fair value, assets	770	576
Equity securities | FES
Assets
Fair value, assets	495	378
Foreign government debt securities
Assets
Fair value, assets	73	75
Foreign government debt securities | FES
Assets
Fair value, assets	57	59
U.S. government debt securities
Assets
Fair value, assets	189	180
U.S. government debt securities | FES
Assets
Fair value, assets	60	23
U.S. state debt securities
Assets
Fair value, assets	247	246
U.S. state debt securities | FES
Assets
Fair value, assets	4	4
Other
Assets
Fair value, assets	430	317
Other | FES
Assets
Fair value, assets	192	184
Level 1
Assets
Fair value, assets	981	685
Liabilities
Fair value, liabilities	(3)	(9)
Net assets (liabilities)	978	676
Level 1 | FES
Assets
Fair value, assets	507	382
Liabilities
Fair value, liabilities	(3)	(9)
Net assets (liabilities)	504	373
Level 1 | Commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(3)	(9)
Level 1 | Commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(3)	(9)
Level 1 | FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 1 | FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	0
Level 1 | NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 1 | Corporate debt securities
Assets
Fair value, assets	0	0
Level 1 | Corporate debt securities | FES
Assets
Fair value, assets	0	0
Level 1 | Commodity contracts | Derivative Assets
Assets
Fair value, assets	12	4
Level 1 | Commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	12	4
Level 1 | FTRs | Derivative Assets
Assets
Fair value, assets	0	0
Level 1 | FTRs | Derivative Assets | FES
Assets
Fair value, assets	0	0
Level 1 | NUG contracts | Derivative Assets
Assets
Fair value, assets	0	0
Level 1 | Equity securities
Assets
Fair value, assets	770	576
Level 1 | Equity securities | FES
Assets
Fair value, assets	495	378
Level 1 | Foreign government debt securities
Assets
Fair value, assets	0	0
Level 1 | Foreign government debt securities | FES
Assets
Fair value, assets	0	0
Level 1 | U.S. government debt securities
Assets
Fair value, assets	0	0
Level 1 | U.S. government debt securities | FES
Assets
Fair value, assets	0	0
Level 1 | U.S. state debt securities
Assets
Fair value, assets	0	0
Level 1 | U.S. state debt securities | FES
Assets
Fair value, assets	0	0
Level 1 | Other
Assets
Fair value, assets	199	105
Level 1 | Other | FES
Assets
Fair value, assets	0	0
Level 2
Assets
Fair value, assets	2,160	2,182
Liabilities
Fair value, liabilities	(137)	(122)
Net assets (liabilities)	2,023	2,060
Level 2 | FES
Assets
Fair value, assets	1,225	1,172
Liabilities
Fair value, liabilities	(137)	(122)
Net assets (liabilities)	1,088	1,050
Level 2 | Commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(137)	(122)
Level 2 | Commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(137)	(122)
Level 2 | FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 2 | FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	0
Level 2 | NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 2 | Corporate debt securities
Assets
Fair value, assets	1,206	1,245
Level 2 | Corporate debt securities | FES
Assets
Fair value, assets	698	678
Level 2 | Commodity contracts | Derivative Assets
Assets
Fair value, assets	214	224
Level 2 | Commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	214	224
Level 2 | FTRs | Derivative Assets
Assets
Fair value, assets	0	0
Level 2 | FTRs | Derivative Assets | FES
Assets
Fair value, assets	0	0
Level 2 | NUG contracts | Derivative Assets
Assets
Fair value, assets	0	0
Level 2 | Equity securities
Assets
Fair value, assets	0	0
Level 2 | Equity securities | FES
Assets
Fair value, assets	0	0
Level 2 | Foreign government debt securities
Assets
Fair value, assets	73	75
Level 2 | Foreign government debt securities | FES
Assets
Fair value, assets	57	59
Level 2 | U.S. government debt securities
Assets
Fair value, assets	189	180
Level 2 | U.S. government debt securities | FES
Assets
Fair value, assets	60	23
Level 2 | U.S. state debt securities
Assets
Fair value, assets	247	246
Level 2 | U.S. state debt securities | FES
Assets
Fair value, assets	4	4
Level 2 | Other
Assets
Fair value, assets	231	212
Level 2 | Other | FES
Assets
Fair value, assets	192	184
Level 3
Assets
Fair value, assets	18	9
Liabilities
Fair value, liabilities	(132)	(150)
Net assets (liabilities)	(114)	(141)
Level 3 | FES
Assets
Fair value, assets	12	5
Liabilities
Fair value, liabilities	(5)	(11)
Net assets (liabilities)	7	(6)
Level 3 | Commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 3 | Commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	0
Level 3 | FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	(8)	(13)
Level 3 | FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(5)	(11)
Level 3 | NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(124)	(137)
Level 3 | Corporate debt securities
Assets
Fair value, assets	0	0
Level 3 | Corporate debt securities | FES
Assets
Fair value, assets	0	0
Level 3 | Commodity contracts | Derivative Assets
Assets
Fair value, assets	0	0
Level 3 | Commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	0	0
Level 3 | FTRs | Derivative Assets
Assets
Fair value, assets	17	8
Level 3 | FTRs | Derivative Assets | FES
Assets
Fair value, assets	12	5
Level 3 | NUG contracts | Derivative Assets
Assets
Fair value, assets	1	1
Level 3 | Equity securities
Assets
Fair value, assets	0	0
Level 3 | Equity securities | FES
Assets
Fair value, assets	0	0
Level 3 | Foreign government debt securities
Assets
Fair value, assets	0	0
Level 3 | Foreign government debt securities | FES
Assets
Fair value, assets	0	0
Level 3 | U.S. government debt securities
Assets
Fair value, assets	0	0
Level 3 | U.S. government debt securities | FES
Assets
Fair value, assets	0	0
Level 3 | U.S. state debt securities
Assets
Fair value, assets	0	0
Level 3 | U.S. state debt securities | FES
Assets
Fair value, assets	0	0
Level 3 | Other
Assets
Fair value, assets	0	0
Level 3 | Other | FES
Assets
Fair value, assets	$ 0	$ 0

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Fair value of assets and liabilities net.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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