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Fair Value Measurements, Recurring (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Commodity derivative contracts | $ 1,043 | $ 1,203
Foreign currency contracts | 10 | 1
Investments of certain benefit plans | 103 | 98
Total gross fair value, assets | 1,161 | 1,313
Commodity derivative contracts, net assets | 43 | 14
Net Carrying Value on Balance Sheet, Assets | 161 | 124
Cash Collateral Received Not Offset | 0 | 0
Liabilities: |  |
Commodity derivative contracts | 1,025 | 1,208
Biofuels blending obligation |  | 10
Foreign currency contracts |  | 1
Total gross fair value, liabilities | 1,058 | 1,219
Commodity derivative contracts, net liabilities | 5 | 6
Net Carrying Value on Balance Sheet, Liabilities | 38 | 17
Cash Collateral Paid Not Offset | (109) | (114)
Fair Value Measurements (Textual) |  |
Fair value asset transfers from Level 1 to Level 2 | 0 | 0
Fair value asset transfers from Level 2 to Level 1 | 0 | 0
Fair value liability transfers from level 1 to level 2 | 0 | 0
Fair value liability transfers from level 2 to level 1 | 0 | 0
Physical Purchase Contracts [Member] |  |
Assets: |  |
Physical purchase contracts | 5 | 11
Liabilities: |  |
Physical purchase and fixed-price contracts | 11 |
RINs Fixed-Price Contracts [Member] |  |
Liabilities: |  |
Physical purchase and fixed-price contracts | 22 |
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Commodity derivative contracts | 1,015 | 1,143
Foreign currency contracts | 10 | 1
Investments of certain benefit plans | 92 | 87
Total gross fair value, assets | 1,117 | 1,231
Liabilities: |  |
Commodity derivative contracts | 997 | 1,138
Biofuels blending obligation |  | 0
Foreign currency contracts |  | 1
Total gross fair value, liabilities | 997 | 1,139
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member] |  |
Assets: |  |
Physical purchase contracts | 0 | 0
Liabilities: |  |
Physical purchase and fixed-price contracts | 0 |
Fair Value, Inputs, Level 1 [Member] | RINs Fixed-Price Contracts [Member] |  |
Liabilities: |  |
Physical purchase and fixed-price contracts | 0 |
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Commodity derivative contracts | 28 | 60
Foreign currency contracts | 0 | 0
Investments of certain benefit plans | 0 | 0
Total gross fair value, assets | 33 | 71
Liabilities: |  |
Commodity derivative contracts | 28 | 70
Biofuels blending obligation |  | 10
Foreign currency contracts |  | 0
Total gross fair value, liabilities | 61 | 80
Fair Value, Inputs, Level 2 [Member] | Physical Purchase Contracts [Member] |  |
Assets: |  |
Physical purchase contracts | 5 | 11
Liabilities: |  |
Physical purchase and fixed-price contracts | 11 |
Fair Value, Inputs, Level 2 [Member] | RINs Fixed-Price Contracts [Member] |  |
Liabilities: |  |
Physical purchase and fixed-price contracts | 22 |
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Commodity derivative contracts | 0 | 0
Foreign currency contracts | 0 | 0
Investments of certain benefit plans | 11 | 11
Total gross fair value, assets | 11 | 11
Liabilities: |  |
Commodity derivative contracts | 0 | 0
Biofuels blending obligation |  | 0
Foreign currency contracts |  | 0
Total gross fair value, liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Physical Purchase Contracts [Member] |  |
Assets: |  |
Physical purchase contracts | 0 | 0
Liabilities: |  |
Physical purchase and fixed-price contracts | 0 |
Fair Value, Inputs, Level 3 [Member] | RINs Fixed-Price Contracts [Member] |  |
Liabilities: |  |
Physical purchase and fixed-price contracts | 0 |
Netting [Member] |  |
Assets: |  |
Effect of Counterparty Netting | (997) | (1,189)
Effect of Cash Collateral Netting | (3) | 0
Liabilities: |  |
Effect of Counterparty Netting | (997) | (1,189)
Effect of Cash Collateral Netting | $ (23) | $ (13)

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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