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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Total derivatives assets | $ 266 | $ 168
Total derivatives liabilities | (578) | (717)
Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 6 | 25
Total derivatives liabilities | (12) | (32)
Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 260 | 143
Total derivatives liabilities | (566) | (685)
Fair Value, Recurring [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 324 | 269
Forward Physical Swaps [Member] | Fair Value, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 2 |
Level 1 | Fair Value, Recurring [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 313 | 265
Level 1 | Forward Physical Swaps [Member] | Fair Value, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 0 |
Level 2 | Fair Value, Recurring [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 11 | 4
Level 2 | Forward Physical Swaps [Member] | Fair Value, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 2 |
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 162 | 53
Total derivatives liabilities | (148) | (71)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 6 | 25
Total derivatives liabilities | (12) | (32)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 98 | 90
Total derivatives liabilities | (164) | (166)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |
Total derivatives assets | 0 | 0
Total derivatives liabilities | $ (254) | $ (448)

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