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Property And Equipment (Schedule Of Proceeds From Offshore Divestitures) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 26 Months Ended
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2011
Property, Plant and Equipment [Line Items] |  |
Cash Proceeds |  | $ 10,002
Brazil [Member] | Discontinued Operations [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cash Proceeds |  | 3,251
Year Of Divestiture | 2011 |
Gulf Of Mexico [Member] | Continuing Operations [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cash Proceeds |  | 4,059
Year Of Divestiture | 2010 |
Azerbaijan [Member] | Discontinued Operations [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cash Proceeds |  | 1,925
Year Of Divestiture | 2010 |
China - Panyu And Exploration [Member] | Discontinued Operations [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cash Proceeds |  | 592
Year Of Divestiture | 2010 |
Other Segment [Member] | Discontinued Operations [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cash Proceeds |  | $ 175
Year Of Divestiture | 2010 |

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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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