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Derivatives and Risk Management Activities (Details 4) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Impact of derivative activities recognized in earnings |  |  |
Total | $ 124,000,000 | $ (36,000,000) | $ 23,000,000
Commodity | Supply and Logistics segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 72,000,000 | (62,000,000) | 16,000,000
Commodity | Facilities segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 3,000,000 | 11,000,000 |
Commodity | Transportation segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total |  |  | 2,000,000
Commodity | Purchases and related costs |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 46,000,000 | 6,000,000 | (4,000,000)
Commodity | Field Operating costs |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 1,000,000 | 1,000,000 | 3,000,000
Interest Rate Contracts | Interest expense |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | (3,000,000) | 1,000,000 | 3,000,000
Net gain associated with interest rate swaps designated as fair value hedges | 2,000,000 | 2,000,000 | 1,000,000
Foreign exchange contracts | Supply and Logistics segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | (1,000,000) | 1,000,000 | 2,000,000
Foreign exchange contracts | Purchases and related costs |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total |  |  | 2,000,000
Foreign exchange contracts | Other income/(expense), net |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 6,000,000 | 6,000,000 | (1,000,000)
Derivatives designated as hedging instruments |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 62,000,000 | (137,000,000) | 25,000,000
Derivatives in Cash Flow Hedging Relationships - Ineffective Portion | (2,000,000) | (8,000,000) | (1,000,000)
Derivatives designated as hedging instruments | Commodity | Supply and Logistics segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 12,000,000 | (161,000,000) | 14,000,000
Derivatives designated as hedging instruments | Commodity | Facilities segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 2,000,000 | 11,000,000 |
Derivatives designated as hedging instruments | Commodity | Transportation segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total |  |  | 2,000,000
Derivatives designated as hedging instruments | Commodity | Purchases and related costs |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 45,000,000 | 6,000,000 | 8,000,000
Derivatives designated as hedging instruments | Interest Rate Contracts | Interest expense |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | (3,000,000) | 1,000,000 | 1,000,000
Derivatives designated as hedging instruments | Foreign exchange contracts | Other income/(expense), net |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 6,000,000 | 6,000,000 |
Derivatives not designated as hedging instruments |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 62,000,000 | 101,000,000 | (2,000,000)
Derivatives not designated as hedging instruments | Commodity | Supply and Logistics segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 60,000,000 | 96,000,000 | 2,000,000
Derivatives not designated as hedging instruments | Commodity | Facilities segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 1,000,000 |  |
Derivatives not designated as hedging instruments | Commodity | Purchases and related costs |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 1,000,000 |  | (12,000,000)
Derivatives not designated as hedging instruments | Commodity | Field Operating costs |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | 1,000,000 | 1,000,000 | 3,000,000
Derivatives not designated as hedging instruments | Interest Rate Contracts | Interest expense |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total |  |  | 2,000,000
Derivatives not designated as hedging instruments | Foreign exchange contracts | Supply and Logistics segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total | (1,000,000) | 1,000,000 | 2,000,000
Derivatives not designated as hedging instruments | Foreign exchange contracts | Purchases and related costs |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total |  |  | 2,000,000
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other income/(expense), net |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total |  |  | $ (1,000,000)

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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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