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Derivative Instruments (Details 1) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivative Assets
Fair Value	$ 60	$ 218
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(21)	(123)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	39	95
Derivative Liabilities
Fair Value	(133)	(238)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	21	123
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	1	1
Net Fair Value	(111)	(114)
Commodity contracts
Derivative Assets
Fair Value	60	210
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(21)	(117)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	39	93
Derivative Liabilities
Fair Value	(26)	(124)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	21	117
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	1
Net Fair Value	(5)	(6)
FTRs
Derivative Assets
Fair Value		7
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments		(6)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged		0
Net Fair Value		1
Derivative Liabilities
Fair Value	(4)	(6)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	0	6
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	1	0
Net Fair Value	(3)	0
NUGs
Derivative Assets
Fair Value		1
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments		0
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged		0
Net Fair Value		1
Derivative Liabilities
Fair Value	(103)	(108)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	0	0
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	(103)	(108)
FES
Derivative Assets
Fair Value	60	214
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(21)	(121)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	39	93
Derivative Liabilities
Fair Value	(28)	(129)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	21	121
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	1	2
Net Fair Value	(6)	(6)
FES | Commodity contracts
Derivative Assets
Fair Value	60	210
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(21)	(117)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	39	93
Derivative Liabilities
Fair Value	(26)	(124)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	21	117
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	1
Net Fair Value	(5)	(6)
FES | FTRs
Derivative Assets
Fair Value		4
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments		(4)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged		0
Net Fair Value		0
Derivative Liabilities
Fair Value	(2)	(5)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	0	4
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	1	1
Net Fair Value	$ (1)	$ 0

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