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Derivative Assets And Liabilities (Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Asset Derivatives | $ 384 | $ 560
Liability Derivatives | (788) | (746)
Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 24 | 0
Liability Derivatives | 0 | (13)
Not Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 360 | 560
Liability Derivatives | (788) | (733)
Broker cleared derivative contracts [Member] |  |
Asset Derivatives | 343 | 402
Liability Derivatives | (350) | (410)
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 41 | 158
Liability Derivatives | (39) | (173)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 24 | 0
Liability Derivatives | 0 | (13)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 319 | 402
Liability Derivatives | (350) | (397)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 0 | 0
Liability Derivatives | $ (399) | $ (163)

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