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Derivative Instruments (Details 1) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivative Assets
Fair Value	$ 54	$ 218
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(17)	(123)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	37	95
Derivative Liabilities
Fair Value	(119)	(238)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	17	123
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	1
Net Fair Value	(102)	(114)
Commodity contracts
Derivative Assets
Fair Value	50	210
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(15)	(117)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	35	93
Derivative Liabilities
Fair Value	(18)	(124)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	15	117
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	1
Net Fair Value	(3)	(6)
FTRs
Derivative Assets
Fair Value	4	7
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(2)	(6)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	2	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 (Received)/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 (Received)/Pledged		0
Net Fair Value		1
Derivative Liabilities
Fair Value	(99)	(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	(99)	(108)
FES
Derivative Assets
Fair Value	50	214
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(16)	(121)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	34	93
Derivative Liabilities
Fair Value	(19)	(129)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	16	121
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	2
Net Fair Value	(3)	(6)
FES | Commodity contracts
Derivative Assets
Fair Value	49	210
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(15)	(117)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	34	93
Derivative Liabilities
Fair Value	(17)	(124)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	15	117
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	1
Net Fair Value	(2)	(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 (Received)/Pledged	0	0
Net Fair Value	0	0
Derivative Liabilities
Fair Value	(2)	(5)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	1	4
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	1
Net Fair Value	$ (1)	$ 0

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