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Derivative Assets And Liabilities (Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Asset Derivatives | $ 560 | $ 321
Liability Derivatives | (746) | (560)
Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 0 | 14
Liability Derivatives | (13) | (2)
Not Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 560 | 307
Liability Derivatives | (733) | (558)
Broker cleared derivative contracts [Member] |  |
Asset Derivatives | 402 | 276
Liability Derivatives | (410) | (283)
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 158 | 45
Liability Derivatives | (173) | (58)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 0 | 14
Liability Derivatives | (13) | (2)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 402 | 262
Liability Derivatives | (397) | (281)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 0 | 0
Liability Derivatives | $ (163) | $ (219)

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