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Fair Value Measurements, Level 3 Reconciliation (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Investments of Certain Benefit Plans [Member] |  |  |  |
Reconciliation of the beginning and ending balances for fair value measurements developed using significant unobservable inputs |  |  |  |
Balance as of beginning of period | $ 11 | $ 11 | $ 11 | $ 10
Purchases | 0 | 0 | 0 | 0
Transfers in and/or out of Level 3 | 0 | 0 | 0 | 0
Balance as of end of period | 11 | 11 | 11 | 11
The amount of total gains (losses) included in income attributable to the change in unrealized gains (losses) relating to assets still held at end of period | 0 | 0 | 0 | 1
Investments of Certain Benefit Plans [Member] | Operating Expense [Member] | Refining [Member] |  |  |  |
Reconciliation of the beginning and ending balances for fair value measurements developed using significant unobservable inputs |  |  |  |
Total gains (losses) included in refining operating expenses | 0 | 0 | 0 | 1
Other Investments [Member] |  |  |  |
Reconciliation of the beginning and ending balances for fair value measurements developed using significant unobservable inputs |  |  |  |
Balance as of beginning of period | 0 | 0 | 0 | 0
Purchases | 0 | 5 | 0 | 21
Transfers in and/or out of Level 3 | 0 | 0 | 0 | 0
Balance as of end of period | 0 | 0 | 0 | 0
The amount of total gains (losses) included in income attributable to the change in unrealized gains (losses) relating to assets still held at end of period | 0 | (5) | 0 | (21)
Other Investments [Member] | Operating Expense [Member] | Refining [Member] |  |  |  |
Reconciliation of the beginning and ending balances for fair value measurements developed using significant unobservable inputs |  |  |  |
Total gains (losses) included in refining operating expenses | $ 0 | $ (5) | $ 0 | $ (21)

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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph d -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. + Details
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- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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Balance Type: | debit
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- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) -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. + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -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. + Details
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