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Derivatives and Risk Management Activities (Details 6) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2012 | Jun. 30, 2012 Level 3 | Jun. 30, 2011 Level 3 | Mar. 31, 2011 Level 3 | Jun. 30, 2012 Level 3 | Jun. 30, 2011 Level 3 | Jun. 30, 2012 Recurring Fair Value Measures Level 1 | Dec. 31, 2011 Recurring Fair Value Measures Level 1 | Jun. 30, 2012 Recurring Fair Value Measures Level 1 Commodity | Dec. 31, 2011 Recurring Fair Value Measures Level 1 Commodity | Jun. 30, 2012 Recurring Fair Value Measures Level 2 | Dec. 31, 2011 Recurring Fair Value Measures Level 2 | Jun. 30, 2012 Recurring Fair Value Measures Level 2 Commodity | Dec. 31, 2011 Recurring Fair Value Measures Level 2 Commodity | Jun. 30, 2012 Recurring Fair Value Measures Level 2 Interest Rate Contracts | Dec. 31, 2011 Recurring Fair Value Measures Level 2 Interest Rate Contracts | Dec. 31, 2011 Recurring Fair Value Measures Level 2 Foreign exchange contracts | Jun. 30, 2012 Recurring Fair Value Measures Level 3 | Dec. 31, 2011 Recurring Fair Value Measures Level 3 | Jun. 30, 2012 Recurring Fair Value Measures Level 3 Commodity | Dec. 31, 2011 Recurring Fair Value Measures Level 3 Commodity | Jun. 30, 2012 Recurring Fair Value Measures Total | Dec. 31, 2011 Recurring Fair Value Measures Total | Jun. 30, 2012 Recurring Fair Value Measures Total Commodity | Dec. 31, 2011 Recurring Fair Value Measures Total Commodity | Jun. 30, 2012 Recurring Fair Value Measures Total Interest Rate Contracts | Dec. 31, 2011 Recurring Fair Value Measures Total Interest Rate Contracts | Dec. 31, 2011 Recurring Fair Value Measures Total Foreign exchange contracts
Recurring Fair Value Measures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset/(liability) at fair value |  |  |  |  |  |  | $ 98 | $ 80 | $ 98 | $ 80 | $ (56) | $ (135) | $ 86 | $ 1 | $ (142) | $ (137) | $ 1 | $ 36 | $ 12 | $ 36 | $ 12 | $ 78 | $ (43) | $ 220 | $ 93 | $ (142) | $ (137) | $ 1
Roll forward of Level 3 Net Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | 2 | (5) | (14) | 12 | (14) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains/(losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  | 12 | 7 |  | 8 | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in other comprehensive income |  |  | 1 |  | 3 | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements |  | (2) | 1 |  | (14) | 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives entered into during the period |  | 19 | 6 |  | 22 | (4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3 (liability) | 5 | 5 |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3 (asset) |  |  |  | (17) |  | (17) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance |  | 36 | 10 | (5) | 36 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods |  | $ 31 | $ 13 |  | $ 33 | $ 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 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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