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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Total derivatives assets | $ 541 | $ 560
Total derivatives liabilities | (877) | (746)
Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 527 | 560
Total derivatives liabilities | (877) | (733)
Fair Value, Measurements, Recurring [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 523 | 583
Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 3 | 21
Level 1 | Fair Value, Measurements, Recurring [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 488 | 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 | 35 | 103
Level 2 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 3 | 21
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 121 | 158
Total derivatives liabilities | (85) | (173)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 14 | 0
Total derivatives liabilities | 0 | (13)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 406 | 402
Total derivatives liabilities | (438) | (397)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 0 | 0
Total derivatives liabilities | $ (354) | $ (163)

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