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Derivative Instruments and Hedging Activities (Balance Sheet Disclosures) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Derivative, Fair Value, Net [Abstract] |  |
Derivative Assets, Short-Term | $ 45 | $ 65
Derivative Assets, Long-Term | 59 | 70
Derivative Liabilities, Short-Term | 173 | 266
Derivative Liabilities, Long-Term | 796 | 805
Economic Hedges |  |
Derivative, Fair Value, Net [Abstract] |  |
Aggregate fair value of all derivative liabilities with credit-risk-related contingent features | 96 | 216
Additional collateral, aggregate fair value | 52 |
Collateral already posted, fair value | 0 | 0
Commodity contracts |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Assets, Short-Term | 45 | 65
Derivative Assets, Long-Term | 59 | 70
Derivative Assets | 104 | 135
Derivative Liabilities, Short-Term | 173 | 266
Derivative Liabilities, Long-Term | 796 | 805
Derivative Liabilities | 969 | 1,071
Net Liability | 865 | 936
Commodity contracts | Economic Hedges |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Assets, Short-Term | 69 | 86
Derivative Assets, Long-Term | 75 | 85
Derivative Assets | 144 | 171
Derivative Liabilities, Short-Term | 245 | 303
Derivative Liabilities, Long-Term | 830 | 856
Derivative Liabilities | 1,075 | 1,159
Net Liability | 931 | 988
Commodity contracts | Netting and Collateral |  |
Derivative, Fair Value, Net [Abstract] |  |
Derivative Assets, Short-Term | (24) | (21)
Derivative Assets, Long-Term | (16) | (15)
Derivative Assets | (40) | (36)
Derivative Liabilities, Short-Term | (72) | (37)
Derivative Liabilities, Long-Term | (34) | (51)
Derivative Liabilities | (106) | (88)
Net Liability | $ (66) | $ (52)

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44D -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 The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44D -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959 + Details
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- Definition Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 133 -Paragraph 4, 17 -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 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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