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Derivative Instruments (Details 1) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Derivative Assets |  |
Fair Value | $ 244 | $ 237
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | (136) | (133)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | (3) | 0
Net Fair Value | 105 | 104
Derivative Liabilities |  |
Fair Value | (272) | (281)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | 136 | 133
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 2 | 8
Net Fair Value | (134) | (140)
Commodity contracts |  |
Derivative Assets |  |
Fair Value | 226 | 228
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | (128) | (125)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | (3) | 0
Net Fair Value | 95 | 103
Derivative Liabilities |  |
Fair Value | (140) | (131)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | 128 | 125
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 2 | 3
Net Fair Value | (10) | (3)
FTRs |  |
Derivative Assets |  |
Fair Value | 17 | 8
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | (8) | (8)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 0 | 0
Net Fair Value | 9 | 0
Derivative Liabilities |  |
Fair Value | (8) | (13)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments | 8 | 8
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged | 0 | 5
Net Fair Value | 0 | 0
NUGs |  |
Derivative Assets |  |
Fair Value | 1 | 1
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 | 1 | 1
Derivative Liabilities |  |
Fair Value | (124) | (137)
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 | $ (124) | $ (137)

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