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Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Assets
Fair value, assets	$ 3,075	$ 3,197
Liabilities
Fair value, liabilities	(133)	(238)
Net assets (liabilities)	2,942	2,959
FES
Assets
Fair value, assets	1,657	1,766
Liabilities
Fair value, liabilities	(28)	(129)
Net assets (liabilities)	1,629	1,637
Derivative liabilities - commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(26)	(124)
Derivative liabilities - commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(26)	(124)
Derivative liabilities - FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	(4)	(6)
Derivative liabilities - FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(2)	(5)
Derivative liabilities - NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(103)	(108)
Corporate debt securities
Assets
Fair value, assets	1,244	1,247
Corporate debt securities | FES
Assets
Fair value, assets	746	726
Derivative liabilities - commodity contracts | Derivative Assets
Assets
Fair value, assets	60	210
Derivative liabilities - commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	60	210
Derivative liabilities - FTRs | Derivative Assets
Assets
Fair value, assets	0	7
Derivative liabilities - FTRs | Derivative Assets | FES
Assets
Fair value, assets	0	4
Derivative liabilities - NUG contracts | Derivative Assets
Assets
Fair value, assets	0	1
Equity securities
Assets
Fair value, assets	982	925
Equity securities | FES
Assets
Fair value, assets	667	634
Foreign government debt securities
Assets
Fair value, assets	95	78
Foreign government debt securities | FES
Assets
Fair value, assets	62	58
U.S. government debt securities
Assets
Fair value, assets	152	161
U.S. government debt securities | FES
Assets
Fair value, assets	30	48
U.S. state debt securities
Assets
Fair value, assets	250	246
U.S. state debt securities | FES
Assets
Fair value, assets	3	3
Other
Assets
Fair value, assets	292	322
Other | FES
Assets
Fair value, assets	89	83
Level 1
Assets
Fair value, assets	1,146	1,134
Liabilities
Fair value, liabilities	0	(6)
Net assets (liabilities)	1,146	1,128
Level 1 | FES
Assets
Fair value, assets	669	646
Liabilities
Fair value, liabilities	0	(6)
Net assets (liabilities)	669	640
Level 1 | Derivative liabilities - commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	(6)
Level 1 | Derivative liabilities - commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	(6)
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	0	10
Level 1 | Derivative liabilities - commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	0	10
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	982	925
Level 1 | Equity securities | FES
Assets
Fair value, assets	667	634
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	164	199
Level 1 | Other | FES
Assets
Fair value, assets	2	2
Level 2
Assets
Fair value, assets	1,929	2,055
Liabilities
Fair value, liabilities	(26)	(118)
Net assets (liabilities)	1,903	1,937
Level 2 | FES
Assets
Fair value, assets	988	1,116
Liabilities
Fair value, liabilities	(26)	(118)
Net assets (liabilities)	962	998
Level 2 | Derivative liabilities - commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(26)	(118)
Level 2 | Derivative liabilities - commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(26)	(118)
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	1,244	1,247
Level 2 | Corporate debt securities | FES
Assets
Fair value, assets	746	726
Level 2 | Derivative liabilities - commodity contracts | Derivative Assets
Assets
Fair value, assets	60	200
Level 2 | Derivative liabilities - commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	60	200
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	95	78
Level 2 | Foreign government debt securities | FES
Assets
Fair value, assets	62	58
Level 2 | U.S. government debt securities
Assets
Fair value, assets	152	161
Level 2 | U.S. government debt securities | FES
Assets
Fair value, assets	30	48
Level 2 | U.S. state debt securities
Assets
Fair value, assets	250	246
Level 2 | U.S. state debt securities | FES
Assets
Fair value, assets	3	3
Level 2 | Other
Assets
Fair value, assets	128	123
Level 2 | Other | FES
Assets
Fair value, assets	87	81
Level 3
Assets
Fair value, assets	0	8
Liabilities
Fair value, liabilities	(107)	(114)
Net assets (liabilities)	(107)	(106)
Level 3 | FES
Assets
Fair value, assets	0	4
Liabilities
Fair value, liabilities	(2)	(5)
Net assets (liabilities)	(2)	(1)
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	(4)	(6)
Level 3 | Derivative liabilities - FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(2)	(5)
Level 3 | Derivative liabilities - NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(103)	(108)
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	0	7
Level 3 | Derivative liabilities - FTRs | Derivative Assets | FES
Assets
Fair value, assets	0	4
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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Fair value of assets and liabilities net.

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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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