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Derivative Financial Instruments (Schedule Of Derivative Obligations Under Terminated Hedge Arrangements) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Derivative [Line Items]
Derivative Liabilities, Current	$ 16us-gaap_DerivativeLiabilitiesCurrent		$ 3us-gaap_DerivativeLiabilitiesCurrent
Derivative gains (losses), net	241	(104)
Commodity Price Derivatives [Member] \| Derivative Gains (Losses), Net [Member]
Derivative [Line Items]
Derivative gains (losses), net	251	(114)
Interest Rate Derivatives [Member] \| Derivative Gains (Losses), Net [Member]
Derivative [Line Items]
Derivative gains (losses), net	(10)	10
Not Designated as Hedging Instrument [Member] \| Derivatives - Current [Member] \| Commodity Price Derivatives [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	6		1
Derivative Liabilities Offset In Balance Sheet	(3)		(1)
Derivative Liabilities, Current	3		0
Not Designated as Hedging Instrument [Member] \| Derivatives - Current [Member] \| Interest Rate Derivatives [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	13		3
Derivative Liabilities Offset In Balance Sheet	0		0
Derivative Liabilities, Current	$ 13		$ 3

Fair value, after the effects of master netting arrangements, of a financial liability or 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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