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Supplemental Information On Oil And Gas Operations (Costs Incurred) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property acquisition costs:
Proved properties	$ 5,210us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	$ 22us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	$ 73us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
Unproved properties	1,177us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	216us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	1,167us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
Exploration costs	322us-gaap_CostsIncurredExplorationCosts	595us-gaap_CostsIncurredExplorationCosts	666us-gaap_CostsIncurredExplorationCosts
Development costs	5,463us-gaap_CostsIncurredDevelopmentCosts	5,089us-gaap_CostsIncurredDevelopmentCosts	6,099us-gaap_CostsIncurredDevelopmentCosts
Costs incurred	12,172us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties	5,922us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties	8,005us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties
United States [Member]
Property acquisition costs:
Proved properties	5,210us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves / us-gaap_StatementGeographicalAxis = country_US	19us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves / us-gaap_StatementGeographicalAxis = country_US	2us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves / us-gaap_StatementGeographicalAxis = country_US
Unproved properties	1,176us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US	213us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US	1,135us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US
Exploration costs	270us-gaap_CostsIncurredExplorationCosts / us-gaap_StatementGeographicalAxis = country_US	443us-gaap_CostsIncurredExplorationCosts / us-gaap_StatementGeographicalAxis = country_US	351us-gaap_CostsIncurredExplorationCosts / us-gaap_StatementGeographicalAxis = country_US
Development costs	4,400us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_US	3,838us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_US	4,408us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_US
Costs incurred	11,056us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US	4,513us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US	5,896us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US
Canada [Member]
Property acquisition costs:
Proved properties		3us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves / us-gaap_StatementGeographicalAxis = country_CA	71us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves / us-gaap_StatementGeographicalAxis = country_CA
Unproved properties	1us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_CA	3us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_CA	32us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_CA
Exploration costs	52us-gaap_CostsIncurredExplorationCosts / us-gaap_StatementGeographicalAxis = country_CA	152us-gaap_CostsIncurredExplorationCosts / us-gaap_StatementGeographicalAxis = country_CA	315us-gaap_CostsIncurredExplorationCosts / us-gaap_StatementGeographicalAxis = country_CA
Development costs	1,063us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_CA	1,251us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_CA	1,691us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_CA
Costs incurred	$ 1,116us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_CA	$ 1,409us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_CA	$ 2,109us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_CA

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Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties.

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

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Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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