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Derivative Instruments (Details 1) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative Assets
Fair Value	$ 40	$ 218
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(11)	(123)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	0
Net Fair Value	29	95
Derivative Liabilities
Fair Value	(106)	(238)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	11	123
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	1
Net Fair Value	(95)	(114)
Commodity contracts
Derivative Assets
Fair Value	35	210
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(9)	(117)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	0
Net Fair Value	26	93
Derivative Liabilities
Fair Value	(12)	(124)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	9	117
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	1
Net Fair Value	(3)	(6)
FTRs
Derivative Assets
Fair Value	5	7
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(2)	(6)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	0
Net Fair Value	3	1
Derivative Liabilities
Fair Value	(2)	(6)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	2	6
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	0
Net Fair Value	0	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 Pledged		0
Net Fair Value		1
Derivative Liabilities
Fair Value	(92)	(108)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	0	0
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	0
Net Fair Value	(92)	(108)
FES
Derivative Assets
Fair Value	36	214
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(10)	(121)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	0
Net Fair Value	26	93
Derivative Liabilities
Fair Value	(13)	(129)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	10	121
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	2
Net Fair Value	(3)	(6)
FES | Commodity contracts
Derivative Assets
Fair Value	35	210
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(9)	(117)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	0
Net Fair Value	26	93
Derivative Liabilities
Fair Value	(12)	(124)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	9	117
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	1
Net Fair Value	(3)	(6)
FES | FTRs
Derivative Assets
Fair Value	1	4
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(1)	(4)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	0
Net Fair Value	0	0
Derivative Liabilities
Fair Value	(1)	(5)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	1	4
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged	0	1
Net Fair Value	$ 0	$ 0

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