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Derivative Instruments (Details 1) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative Assets |  |
Fair Value | $ 37 | $ 218
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | (20) | (123)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 0 | 0
Net Fair Value | 17 | 95
Derivative Liabilities |  |
Fair Value | (107) | (238)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | 20 | 123
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 3 | 1
Net Fair Value | (84) | (114)
Commodity contracts |  |
Derivative Assets |  |
Fair Value | 33 | 210
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | (19) | (117)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 0 | 0
Net Fair Value | 14 | 93
Derivative Liabilities |  |
Fair Value | (27) | (124)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | 19 | 117
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 3 | 1
Net Fair Value | (5) | (6)
FTRs |  |
Derivative Assets |  |
Fair Value | 4 | 7
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | (1) | (6)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 0 | 0
Net Fair Value | 3 | 1
Derivative Liabilities |  |
Fair Value | (1) | (6)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | 1 | 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 | (79) | (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 | (79) | (108)
FES |  |
Derivative Assets |  |
Fair Value | 34 | 214
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | (20) | (121)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 0 | 0
Net Fair Value | 14 | 93
Derivative Liabilities |  |
Fair Value | (24) | (129)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | 20 | 121
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 0 | 2
Net Fair Value | (4) | (6)
FES | Commodity contracts |  |
Derivative Assets |  |
Fair Value | 33 | 210
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | (19) | (117)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 0 | 0
Net Fair Value | 14 | 93
Derivative Liabilities |  |
Fair Value | (23) | (124)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | 19 | 117
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 0 | 1
Net Fair Value | (4) | (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 | (1) | (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 | $ 0 | $ 0

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