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Supplemental Information On Oil And Gas Operations (Standardized Measure Of Discounted Future Net Cash Flows Related To Interest In Proved Reserves) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | $ 107,218 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows | $ 95,288 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows | $ 88,867 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows |
Future costs: |  |  |  |
Development | (10,787)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts | (10,756)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts | (12,767)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts |
Production | (43,972)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts | (42,372)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts | (40,876)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts |
Future income tax expense | (14,047)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense | (11,373)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense | (8,534)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense |
Future net cash flow | 38,412 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows | 30,787 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows | 26,690 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows |
10% discount to reflect timing of cash flows | (17,938)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows | (15,046)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows | (13,469)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows |
Standardized measure of discounted future net cash flows | 20,474 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | 15,741 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | 13,221 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | 17,844 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
United States [Member] |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 75,847 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows / us-gaap_StatementGeographicalAxis = country_US | 61,983 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows / us-gaap_StatementGeographicalAxis = country_US | 55,297 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows / us-gaap_StatementGeographicalAxis = country_US |
Future costs: |  |  |  |
Development | (7,168)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_US | (5,448)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_US | (6,556)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_US |
Production | (29,740)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts / us-gaap_StatementGeographicalAxis = country_US | (26,663)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts / us-gaap_StatementGeographicalAxis = country_US | (24,265)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts / us-gaap_StatementGeographicalAxis = country_US |
Future income tax expense | (11,021)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_US | (9,046)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_US | (6,542)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_US |
Future net cash flow | 27,918 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows / us-gaap_StatementGeographicalAxis = country_US | 20,826 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows / us-gaap_StatementGeographicalAxis = country_US | 17,934 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows / us-gaap_StatementGeographicalAxis = country_US |
10% discount to reflect timing of cash flows | (12,819)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows / us-gaap_StatementGeographicalAxis = country_US | (10,346)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows / us-gaap_StatementGeographicalAxis = country_US | (9,036)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows / us-gaap_StatementGeographicalAxis = country_US |
Standardized measure of discounted future net cash flows | 15,099 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves / us-gaap_StatementGeographicalAxis = country_US | 10,480 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves / us-gaap_StatementGeographicalAxis = country_US | 8,898 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves / us-gaap_StatementGeographicalAxis = country_US |
Canada [Member] |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 31,371 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows / us-gaap_StatementGeographicalAxis = country_CA | 33,305 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows / us-gaap_StatementGeographicalAxis = country_CA | 33,570 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows / us-gaap_StatementGeographicalAxis = country_CA |
Future costs: |  |  |  |
Development | (3,619)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_CA | (5,308)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_CA | (6,211)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_CA |
Production | (14,232)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts / us-gaap_StatementGeographicalAxis = country_CA | (15,709)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts / us-gaap_StatementGeographicalAxis = country_CA | (16,611)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts / us-gaap_StatementGeographicalAxis = country_CA |
Future income tax expense | (3,026)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_CA | (2,327)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_CA | (1,992)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_CA |
Future net cash flow | 10,494 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows / us-gaap_StatementGeographicalAxis = country_CA | 9,961 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows / us-gaap_StatementGeographicalAxis = country_CA | 8,756 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows / us-gaap_StatementGeographicalAxis = country_CA |
10% discount to reflect timing of cash flows | (5,119)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows / us-gaap_StatementGeographicalAxis = country_CA | (4,700)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows / us-gaap_StatementGeographicalAxis = country_CA | (4,433)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows / us-gaap_StatementGeographicalAxis = country_CA |
Standardized measure of discounted future net cash flows | $ 5,375 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves / us-gaap_StatementGeographicalAxis = country_CA | $ 5,261 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves / us-gaap_StatementGeographicalAxis = country_CA | $ 4,323 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves / us-gaap_StatementGeographicalAxis = country_CA |

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- Definition Amount of estimated future accumulated cash inflow from the sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62424-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62455-109447 + Details
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- Definition Amount of estimated future accumulated cash outflow for costs to be incurred in developing proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62424-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62455-109447 + Details
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- Definition Amount of estimated future accumulated cash outflow for income tax, based on the future income less future expense derived from production and sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62424-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62455-109447 + Details
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- Definition Amount of discount on future accumulated cash inflow, after deducting future accumulated cash outflow for development and production costs and future income tax, from sale of proved oil and gas reserves, using a discount rate of ten percent a year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62424-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62455-109447 + Details
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