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Fair Value Measurements, Recurring (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Assets: |  |
Commodity derivative contracts | $ 1,210 | $ 537
Investments of certain benefit plans | 111 | 109
Total gross fair value, assets | 1,321 | 646
Effect of Counterparty Netting | (1,182) | (505)
Effect of Cash Collateral Netting | (5) | (7)
Commodity derivative contracts, net assets | 23 | 25
Net Carrying Value on Balance Sheet, Assets | 134 | 134
Cash Collateral Received Not Offset | 0 | 0
Liabilities: |  |
Commodity derivative contracts | 1,292 | 516
Biofuels blending obligation | 77 | 11
Foreign currency contracts | 13 | 8
Total gross fair value, liabilities | 1,393 | 540
Effect of Counterparty Netting | (1,182) | (505)
Effect of Cash Collateral Netting | (109) | (6)
Commodity derivative contracts, net liabilities | 1 | 5
Net Carrying Value on Balance Sheet, Liabilities | 102 | 29
Cash Collateral Paid Not Offset | (159) | (76)
Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Physical purchase contracts | 11 | 5
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Commodity derivative contracts | 1,182 | 499
Investments of certain benefit plans | 100 | 98
Total gross fair value, assets | 1,282 | 597
Liabilities: |  |
Commodity derivative contracts | 1,260 | 492
Biofuels blending obligation | 0 | 0
Foreign currency contracts | 13 | 8
Total gross fair value, liabilities | 1,273 | 500
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Physical purchase contracts | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Commodity derivative contracts | 28 | 38
Investments of certain benefit plans | 0 | 0
Total gross fair value, assets | 28 | 38
Liabilities: |  |
Commodity derivative contracts | 32 | 24
Biofuels blending obligation | 77 | 11
Foreign currency contracts | 0 | 0
Total gross fair value, liabilities | 120 | 40
Fair Value, Inputs, Level 2 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Physical purchase contracts | 11 | 5
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Commodity derivative 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 | 0
Foreign currency contracts | 0 | 0
Total gross fair value, liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Physical purchase contracts | $ 0 | $ 0

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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=35743120&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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- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 + Details
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