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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)

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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- Definition

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+ References

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