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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2013
Fair Value Disclosures [Abstract] |
Fair value of financial assets and liabilities measured on recurring basis | The tables below present information (in millions) about our financial instruments recognized at their fair values in our balance sheets categorized according to the fair value hierarchy of the inputs utilized by us to determine the fair values as of March 31, 2013 and December 31, 2012. We have elected to offset the fair value amounts recognized for multiple similar derivative contracts executed with the same counterparty, including any related cash collateral assets or obligations as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the tables below. We have no derivative contracts that are subject to master netting arrangements that are reflected gross on the balance sheet.
| March 31, 2013
| Fair Value Hierarchy |  | Total Gross Fair Value |  | Effect of Counter- party Netting |  | Effect of Collateral Netting |  | Net Carrying Value on Balance Sheet |  | Cash Collateral Paid or Received Not Offset
| Level 1 |  | Level 2 |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts | $ | 1,036 |  |  | $ | 30 |  |  | $ | — |  |  | $ | 1,066 |  |  | $ | (989 | ) |  | $ | — |  |  | $ | 77 |  |  | $ | — |
Physical purchase contracts | — |  |  | 8 |  |  | — |  |  | 8 |  |  | N/A |  |  | N/A |  |  | 8 |  |  | N/A |
RINs fixed-price contracts | — |  |  | (12 | ) |  | — |  |  | (12 | ) |  | N/A |  |  | N/A |  |  | (12 | ) |  | N/A |
Investments of certain benefit plans | 91 |  |  | — |  |  | 11 |  |  | 102 |  |  | N/A |  |  | N/A |  |  | 102 |  |  | N/A |
Total | $ | 1,127 |  |  | $ | 26 |  |  | $ | 11 |  |  | $ | 1,164 |  |  | $ | (989 | ) |  | $ | — |  |  | $ | 175 |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts | $ | 983 |  |  | $ | 30 |  |  | $ | — |  |  | $ | 1,013 |  |  | $ | (989 | ) |  | $ | (17 | ) |  | $ | 7 |  |  | $ | (82 | )
Foreign currency contracts | 3 |  |  | — |  |  | — |  |  | 3 |  |  | N/A |  |  | N/A |  |  | 3 |  |  | N/A |
Total | $ | 986 |  |  | $ | 30 |  |  | $ | — |  |  | $ | 1,016 |  |  | $ | (989 | ) |  | $ | (17 | ) |  | $ | 10 |  |  |
| December 31, 2012
| Fair Value Hierarchy |  | Total Gross Fair Value |  | Effect of Counter- party Netting |  | Effect of Collateral Netting |  | Net Carrying Value on Balance Sheet |  | Cash Collateral Paid or Received Not Offset
| Level 1 |  | Level 2 |  | Level 3 |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts | $ | 1,143 |  |  | $ | 60 |  |  | $ | — |  |  | $ | 1,203 |  |  | $ | (1,189 | ) |  | $ | — |  |  | $ | 14 |  |  | $ | — |
Physical purchase contracts | — |  |  | 11 |  |  | — |  |  | 11 |  |  | N/A |  |  | N/A |  |  | 11 |  |  | N/A |
Investments of certain benefit plans | 87 |  |  | — |  |  | 11 |  |  | 98 |  |  | N/A |  |  | N/A |  |  | 98 |  |  | N/A |
Foreign currency contracts | 1 |  |  | — |  |  | — |  |  | 1 |  |  | N/A |  |  | N/A |  |  | 1 |  |  | N/A |
Total | $ | 1,231 |  |  | $ | 71 |  |  | $ | 11 |  |  | $ | 1,313 |  |  | $ | (1,189 | ) |  | $ | — |  |  | $ | 124 |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts | $ | 1,138 |  |  | $ | 70 |  |  | $ | — |  |  | $ | 1,208 |  |  | $ | (1,189 | ) |  | $ | (13 | ) |  | $ | 6 |  |  | $ | (114 | )
Biofuels blending obligation | — |  |  | 10 |  |  | — |  |  | 10 |  |  | N/A |  |  | N/A |  |  | 10 |  |  | N/A |
Foreign currency contracts | 1 |  |  | — |  |  | — |  |  | 1 |  |  | N/A |  |  | N/A |  |  | 1 |  |  | N/A |
Total | $ | 1,139 |  |  | $ | 80 |  |  | $ | — |  |  | $ | 1,219 |  |  | $ | (1,189 | ) |  | $ | (13 | ) |  | $ | 17 |  |  |
Reconciliation of the beginning and ending balances for fair value measurements developed using significant unobservable inputs | The following is a reconciliation of the beginning and ending balances (in millions) for fair value measurements developed using significant unobservable inputs (Level 3).
| 2013 |  | 2012
| Investments of Certain Benefit Plans |  | Investments of Certain Benefit Plans
Three months ended March 31: |  |  |
Balance as of beginning of period | $ | 11 |  |  | $ | 11 |
Purchases | — |  |  | — |
Total gains (losses) included in refining operating expenses | — |  |  | — |
Transfers in and/or out of Level 3 | — |  |  | — |
Balance as of end of period | $ | 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 | $ | — |  |  | $ | — |
Fair value of assets measured on a nonrecurring basis | The table below presents the fair value (in millions) of our nonfinancial assets measured on a nonrecurring basis during the three months ended March 31, 2012 and categorized according to the fair value hierarchy of the inputs utilized by us to determine the fair values as of March 31, 2012.
| Fair Value Measurements Using |  |  |  | Total Loss Recognized During the Three Months Ended March 31, 2012
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value as of March 31, 2012 |
Assets: |  |  |  |  |  |  |  |  |
Long-lived assets of the Aruba Refinery | $ | — |  |  | $ | — |  |  | $ | 350 |  |  | $ | 350 |  |  | $ | 595 |
Cancelled capital project | — |  |  | — |  |  | 2 |  |  | 2 |  |  | 16 |
Carrying amounts and estimated fair value of financial instruments | Financial instruments that we recognize in our balance sheets at their carrying amounts are shown in the table below (in millions):
| March 31, 2013 |  | December 31, 2012
| Carrying Amount |  | Fair Value |  | Carrying Amount |  |  | Fair Value |
Financial assets: |  |  |  |  |  |  |
Cash and temporary cash investments | $ | 1,857 |  |  | $ | 1,857 |  |  | $ | 1,723 |  |  | $ | 1,723 |
Financial liabilities: |  |  |  |  |  |  |
Debt (excluding capital leases) | 6,821 |  |  | 8,414 |  |  | 7,000 |  |  | 8,621 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph a, b -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + 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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 Reference 3: 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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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph c(2), d, e, f -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 Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), 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. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and 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 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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