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Derivative Assets And Liabilities (Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Asset Derivatives | $ 363 | $ 454
Liability Derivatives | (672) | (532)
Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 0 | 38
Liability Derivatives | (4) | (3)
Designated as Hedging Instrument [Member] | Commodity Derivatives (Margin Deposits) [Member] |  |
Asset Derivatives | 0 | 38
Liability Derivatives | (4) | (3)
Not Designated as Hedging Instrument [Member] |  |
Asset Derivatives | 363 | 416
Liability Derivatives | (668) | (529)
Not Designated as Hedging Instrument [Member] | Commodity Derivatives (Margin Deposits) [Member] |  |
Asset Derivatives | 338 | 353
Liability Derivatives | (416) | (306)
Not Designated as Hedging Instrument [Member] | Commodity Derivatives [Member] |  |
Asset Derivatives | 25 | 63
Liability Derivatives | (58) | (47)
Not Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member] |  |
Asset Derivatives | 0 | 0
Liability Derivatives | (193) | (171)
Not Designated as Hedging Instrument [Member] | Embedded Derivatives [Member] |  |
Asset Derivatives | 0 | 0
Liability Derivatives | (1) | (5)
Broker cleared derivative contracts [Member] |  |
Asset Derivatives | 338 | 391
Liability Derivatives | $ (420) | $ (309)

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