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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Total derivatives assets | $ 419 | $ 321
Total derivatives liabilities | (931) | (560)
Designated as Hedging Instrument [Member] | Commodity Derivatives (Margin Deposits) [Member] |  |
Total derivatives assets | 0 | 14
Total derivatives liabilities | (2) | (2)
Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 419 | 307
Total derivatives liabilities | (929) | (558)
Not Designated as Hedging Instrument [Member] | Commodity Derivatives (Margin Deposits) [Member] |  |
Total derivatives assets | 307 | 262
Total derivatives liabilities | (352) | (281)
Not Designated as Hedging Instrument [Member] | Commodity Derivatives [Member] |  |
Total derivatives assets | 112 | 45
Total derivatives liabilities | (430) | (58)
Not Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member] |  |
Total derivatives assets | 0 | 0
Total derivatives liabilities | (147) | (219)
Fair Value, Measurements, Recurring [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 784 | 341
Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 5 | (2)
Level 1 | Fair Value, Measurements, Recurring [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 721 | 303
Level 1 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 0 | 0
Level 2 | Fair Value, Measurements, Recurring [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 63 | 38
Level 2 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | $ (5) | $ (2)

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