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Derivatives and Risk Management Activities (Details 7) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2013 Level 3 | Mar. 31, 2012 Level 3 | Dec. 31, 2012 Recurring Fair Value Measures Level 1 | Dec. 31, 2012 Recurring Fair Value Measures Level 1 Commodity | Mar. 31, 2013 Recurring Fair Value Measures Level 2 | Dec. 31, 2012 Recurring Fair Value Measures Level 2 | Mar. 31, 2013 Recurring Fair Value Measures Level 2 Commodity | Dec. 31, 2012 Recurring Fair Value Measures Level 2 Commodity | Mar. 31, 2013 Recurring Fair Value Measures Level 2 Interest Rate Contracts | Dec. 31, 2012 Recurring Fair Value Measures Level 2 Interest Rate Contracts | Mar. 31, 2013 Recurring Fair Value Measures Level 2 Foreign exchange contracts | Mar. 31, 2013 Recurring Fair Value Measures Level 3 | Dec. 31, 2012 Recurring Fair Value Measures Level 3 | Mar. 31, 2013 Recurring Fair Value Measures Level 3 Commodity | Dec. 31, 2012 Recurring Fair Value Measures Level 3 Commodity | Mar. 31, 2013 Recurring Fair Value Measures Total | Dec. 31, 2012 Recurring Fair Value Measures Total | Mar. 31, 2013 Recurring Fair Value Measures Total Commodity | Dec. 31, 2012 Recurring Fair Value Measures Total Commodity | Mar. 31, 2013 Recurring Fair Value Measures Total Interest Rate Contracts | Dec. 31, 2012 Recurring Fair Value Measures Total Interest Rate Contracts | Mar. 31, 2013 Recurring Fair Value Measures Total Foreign exchange contracts
Recurring Fair Value Measures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset/(liability) at fair value |  |  | $ 1 | $ 1 | $ 21 | $ (3) | $ 43 | $ 35 | $ (21) | $ (38) | $ (1) | $ 1 | $ 4 | $ 1 | $ 4 | $ 22 | $ 2 | $ 44 | $ 40 | $ (21) | $ (38) | $ (1)
Roll forward of Level 3 Net Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | 4 | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains/(losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  | (4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in other comprehensive income |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements | (3) | (12) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives entered into during the period |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods |  | $ (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Derivatives entered into during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition The total gains or losses for the period (realized and unrealized), arising from the derivative net asset/liability balance measured at fair value on a recurring basis using unobservable inputs (Level 3) which are included in earnings or resulted in a changed in net asset/liability balance. + References No definition available. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets).Such unrealized (holding) gains or losses relate to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition The total gains or losses for the period (realized and unrealized), arising from the derivative net asset/liability balance measured at fair value on a recurring basis using unobservable inputs (Level 3) which are included in other comprehensive income (a separate component of shareholders' equity). + References No definition available. + Details
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- Definition The derivative net asset/liability balance measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + 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 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 3: 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 4: 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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