Derivative Financial Instruments (Schedule Of Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Assets, Current	$ 624us-gaap_DerivativeAssetsCurrent	$ 578us-gaap_DerivativeAssetsCurrent
Derivative Assets, Noncurrent	181us-gaap_DerivativeAssetsNoncurrent	181us-gaap_DerivativeAssetsNoncurrent
Derivative Liabilities, Current	16us-gaap_DerivativeLiabilitiesCurrent	3us-gaap_DerivativeLiabilitiesCurrent
Derivative Liabilities, Noncurrent	0us-gaap_DerivativeLiabilitiesNoncurrent	2us-gaap_DerivativeLiabilitiesNoncurrent
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	805	759
Derivative Liability, Fair Value, Net	16	5
Not Designated as Hedging Instrument [Member] \| Commodity Price Derivatives [Member] \| Derivatives - Current [Member]
Derivative [Line Items]
Total derivatives, Asset, Gross	627	579
Derivative Liability, Fair Value, Gross Liability	6	1
Derivative Assets Offset In Balance Sheet	(3)	(1)
Derivative Liabilities Offset In Balance Sheet	(3)	(1)
Derivative Assets, Current	624	578
Derivative Liabilities, Current	3	0
Not Designated as Hedging Instrument [Member] \| Commodity Price Derivatives [Member] \| Derivatives - Noncurrent [Member]
Derivative [Line Items]
Total derivatives, Asset, Gross	183	182
Derivative Liability, Fair Value, Gross Liability	2	3
Derivative Assets Offset In Balance Sheet	(2)	(1)
Derivative Liabilities Offset In Balance Sheet	(2)	(1)
Derivative Assets, Noncurrent	181	181
Derivative Liabilities, Noncurrent	0	2
Not Designated as Hedging Instrument [Member] \| Interest Rate Derivatives [Member] \| Derivatives - Current [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

Derivative Assets Offset In Balance Sheet

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Derivative Liabilities Offset In Balance Sheet

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

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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.

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Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of 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, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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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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