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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Total derivatives assets | $ 338 | $ 560
Total derivatives liabilities | (541) | (746)
Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 336 | 560
Total derivatives liabilities | (540) | (733)
Fair Value, Measurements, Recurring [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 309 | 583
Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 5 | 21
Level 1 | Fair Value, Measurements, Recurring [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 267 | 480
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 | 42 | 103
Level 2 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 5 | 21
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 127 | 158
Total derivatives liabilities | (60) | (173)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 2 | 0
Total derivatives liabilities | (1) | (13)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 209 | 402
Total derivatives liabilities | (248) | (397)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 0 | 0
Total derivatives liabilities | $ (232) | $ (163)

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