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Supplemental Information On Oil And Gas Operations (Capitalized Costs) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proved properties	$ 75,738us-gaap_CapitalizedCostsProvedProperties	$ 73,995us-gaap_CapitalizedCostsProvedProperties
Unproved properties	2,752us-gaap_CapitalizedCostsUnprovedProperties	2,791us-gaap_CapitalizedCostsUnprovedProperties
Total oil and gas properties	78,490us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross	76,786us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross
Accumulated DD and A	(49,560)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	(52,461)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities
Net capitalized costs	28,930us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet	24,325us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
United States [Member]
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proved properties	59,849us-gaap_CapitalizedCostsProvedProperties / us-gaap_StatementGeographicalAxis = country_US	51,366us-gaap_CapitalizedCostsProvedProperties / us-gaap_StatementGeographicalAxis = country_US
Unproved properties	1,460us-gaap_CapitalizedCostsUnprovedProperties / us-gaap_StatementGeographicalAxis = country_US	1,277us-gaap_CapitalizedCostsUnprovedProperties / us-gaap_StatementGeographicalAxis = country_US
Total oil and gas properties	61,309us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross / us-gaap_StatementGeographicalAxis = country_US	52,643us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross / us-gaap_StatementGeographicalAxis = country_US
Accumulated DD and A	(38,213)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities / us-gaap_StatementGeographicalAxis = country_US	(35,848)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities / us-gaap_StatementGeographicalAxis = country_US
Net capitalized costs	23,096us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet / us-gaap_StatementGeographicalAxis = country_US	16,795us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet / us-gaap_StatementGeographicalAxis = country_US
Canada [Member]
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proved properties	15,889us-gaap_CapitalizedCostsProvedProperties / us-gaap_StatementGeographicalAxis = country_CA	22,629us-gaap_CapitalizedCostsProvedProperties / us-gaap_StatementGeographicalAxis = country_CA
Unproved properties	1,292us-gaap_CapitalizedCostsUnprovedProperties / us-gaap_StatementGeographicalAxis = country_CA	1,514us-gaap_CapitalizedCostsUnprovedProperties / us-gaap_StatementGeographicalAxis = country_CA
Total oil and gas properties	17,181us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross / us-gaap_StatementGeographicalAxis = country_CA	24,143us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross / us-gaap_StatementGeographicalAxis = country_CA
Accumulated DD and A	(11,347)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities / us-gaap_StatementGeographicalAxis = country_CA	(16,613)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities / us-gaap_StatementGeographicalAxis = country_CA
Net capitalized costs	$ 5,834us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet / us-gaap_StatementGeographicalAxis = country_CA	$ 7,530us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet / us-gaap_StatementGeographicalAxis = country_CA

X

- Definition

Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 13

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- Definition

The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

+ References

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-Publisher FASB

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Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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