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Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Assets
Fair value, assets	$ 3,582	$ 2,876
Liabilities
Fair value, liabilities	(259)	(281)
Net assets (liabilities)	3,323	2,595
FES
Assets
Fair value, assets	1,787	1,559
Liabilities
Fair value, liabilities	(139)	(142)
Net assets (liabilities)	1,648	1,417
Derivative liabilities - commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(134)	(131)
Derivative liabilities - commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(134)	(131)
Derivative liabilities - FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	(7)	(13)
Derivative liabilities - FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(5)	(11)
Derivative liabilities - NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(118)	(137)
Corporate debt securities
Assets
Fair value, assets	1,242	1,245
Corporate debt securities | FES
Assets
Fair value, assets	714	678
Derivative liabilities - commodity contracts | Derivative Assets
Assets
Fair value, assets	237	228
Derivative liabilities - commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	237	228
Derivative liabilities - FTRs | Derivative Assets
Assets
Fair value, assets	13	8
Derivative liabilities - FTRs | Derivative Assets | FES
Assets
Fair value, assets	7	5
Derivative liabilities - NUG contracts | Derivative Assets
Assets
Fair value, assets	0	1
Equity securities
Assets
Fair value, assets	908	576
Equity securities | FES
Assets
Fair value, assets	624	378
Foreign government debt securities
Assets
Fair value, assets	77	75
Foreign government debt securities | FES
Assets
Fair value, assets	59	59
U.S. government debt securities
Assets
Fair value, assets	173	180
U.S. government debt securities | FES
Assets
Fair value, assets	53	23
U.S. state debt securities
Assets
Fair value, assets	255	246
U.S. state debt securities | FES
Assets
Fair value, assets	4	4
Other
Assets
Fair value, assets	677	317
Other | FES
Assets
Fair value, assets	89	184
Level 1
Assets
Fair value, assets	1,466	685
Liabilities
Fair value, liabilities	(12)	(9)
Net assets (liabilities)	1,454	676
Level 1 | FES
Assets
Fair value, assets	633	382
Liabilities
Fair value, liabilities	(12)	(9)
Net assets (liabilities)	621	373
Level 1 | Derivative liabilities - commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(12)	(9)
Level 1 | Derivative liabilities - commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(12)	(9)
Level 1 | Derivative liabilities - FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 1 | Derivative liabilities - FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	0
Level 1 | Derivative liabilities - 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 | Derivative liabilities - commodity contracts | Derivative Assets
Assets
Fair value, assets	7	4
Level 1 | Derivative liabilities - commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	7	4
Level 1 | Derivative liabilities - FTRs | Derivative Assets
Assets
Fair value, assets	0	0
Level 1 | Derivative liabilities - FTRs | Derivative Assets | FES
Assets
Fair value, assets	0	0
Level 1 | Derivative liabilities - NUG contracts | Derivative Assets
Assets
Fair value, assets	0	0
Level 1 | Equity securities
Assets
Fair value, assets	908	576
Level 1 | Equity securities | FES
Assets
Fair value, assets	624	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	551	105
Level 1 | Other | FES
Assets
Fair value, assets	2	0
Level 2
Assets
Fair value, assets	2,103	2,182
Liabilities
Fair value, liabilities	(122)	(122)
Net assets (liabilities)	1,981	2,060
Level 2 | FES
Assets
Fair value, assets	1,147	1,172
Liabilities
Fair value, liabilities	(122)	(122)
Net assets (liabilities)	1,025	1,050
Level 2 | Derivative liabilities - commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(122)	(122)
Level 2 | Derivative liabilities - commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(122)	(122)
Level 2 | Derivative liabilities - FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 2 | Derivative liabilities - FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	0
Level 2 | Derivative liabilities - NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 2 | Corporate debt securities
Assets
Fair value, assets	1,242	1,245
Level 2 | Corporate debt securities | FES
Assets
Fair value, assets	714	678
Level 2 | Derivative liabilities - commodity contracts | Derivative Assets
Assets
Fair value, assets	230	224
Level 2 | Derivative liabilities - commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	230	224
Level 2 | Derivative liabilities - FTRs | Derivative Assets
Assets
Fair value, assets	0	0
Level 2 | Derivative liabilities - FTRs | Derivative Assets | FES
Assets
Fair value, assets	0	0
Level 2 | Derivative liabilities - 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	77	75
Level 2 | Foreign government debt securities | FES
Assets
Fair value, assets	59	59
Level 2 | U.S. government debt securities
Assets
Fair value, assets	173	180
Level 2 | U.S. government debt securities | FES
Assets
Fair value, assets	53	23
Level 2 | U.S. state debt securities
Assets
Fair value, assets	255	246
Level 2 | U.S. state debt securities | FES
Assets
Fair value, assets	4	4
Level 2 | Other
Assets
Fair value, assets	126	212
Level 2 | Other | FES
Assets
Fair value, assets	87	184
Level 3
Assets
Fair value, assets	13	9
Liabilities
Fair value, liabilities	(125)	(150)
Net assets (liabilities)	(112)	(141)
Level 3 | FES
Assets
Fair value, assets	7	5
Liabilities
Fair value, liabilities	(5)	(11)
Net assets (liabilities)	2	(6)
Level 3 | Derivative liabilities - commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 3 | Derivative liabilities - commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	0
Level 3 | Derivative liabilities - FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	(7)	(13)
Level 3 | Derivative liabilities - FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(5)	(11)
Level 3 | Derivative liabilities - NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(118)	(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 | Derivative liabilities - commodity contracts | Derivative Assets
Assets
Fair value, assets	0	0
Level 3 | Derivative liabilities - commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	0	0
Level 3 | Derivative liabilities - FTRs | Derivative Assets
Assets
Fair value, assets	13	8
Level 3 | Derivative liabilities - FTRs | Derivative Assets | FES
Assets
Fair value, assets	7	5
Level 3 | Derivative liabilities - NUG contracts | Derivative Assets
Assets
Fair value, assets	0	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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+ References

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