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Derivatives and Risk Management Activities (Details 6) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Level 3 |  |  |  |  |
Roll forward of Level 3 Net Asset |  |  |  |  |
Beginning Balance |  |  | $ (14) | $ 12 | $ (14)
Unrealized gains/(losses): |  |  |  |  |
Included in earnings |  |  |  | (3) | 17
Included in other comprehensive income |  |  |  | 3 | 2
Settlements |  |  |  | (22) | 21
Derivatives entered into during the period |  |  |  | 23 | 3
Transfers out of Level 3 (liability) |  | 5 |  |  |
Transfers out of Level 3 (asset) | (14) |  | (17) | (9) | (17)
Ending Balance |  |  |  | 4 | 12
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods |  |  |  | 24 | 22
Recurring Fair Value Measures | Level 1 |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  | 1 | 80
Recurring Fair Value Measures | Level 1 | Commodity |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  | 1 | 80
Recurring Fair Value Measures | Level 2 |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  | (3) | (135)
Recurring Fair Value Measures | Level 2 | Commodity |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  | 35 | 1
Recurring Fair Value Measures | Level 2 | Interest Rate Contracts |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  | (38) | (137)
Recurring Fair Value Measures | Level 2 | Foreign exchange contracts |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  |  | 1
Recurring Fair Value Measures | Level 3 |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  | 4 | 12
Recurring Fair Value Measures | Level 3 | Commodity |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  | 4 | 12
Recurring Fair Value Measures | Total |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  | 2 | (43)
Recurring Fair Value Measures | Total | Commodity |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  | 40 | 93
Recurring Fair Value Measures | Total | Interest Rate Contracts |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  | (38) | (137)
Recurring Fair Value Measures | Total | Foreign exchange contracts |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net asset/(liability) at fair value |  |  |  |  | $ 1

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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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