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Derivatives and Risk Management Activities (Details 7) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Sep. 30, 2013 Level 3 | Sep. 30, 2012 Level 3 | Jun. 30, 2012 Level 3 | Sep. 30, 2013 Level 3 | Sep. 30, 2012 Level 3 | Sep. 30, 2013 Recurring Fair Value Measures Level 1 | Dec. 31, 2012 Recurring Fair Value Measures Level 1 | Sep. 30, 2013 Recurring Fair Value Measures Level 1 Commodity | Dec. 31, 2012 Recurring Fair Value Measures Level 1 Commodity | Sep. 30, 2013 Recurring Fair Value Measures Level 2 | Dec. 31, 2012 Recurring Fair Value Measures Level 2 | Sep. 30, 2013 Recurring Fair Value Measures Level 2 Commodity | Dec. 31, 2012 Recurring Fair Value Measures Level 2 Commodity | Sep. 30, 2013 Recurring Fair Value Measures Level 2 Interest Rate Contracts | Dec. 31, 2012 Recurring Fair Value Measures Level 2 Interest Rate Contracts | Sep. 30, 2013 Recurring Fair Value Measures Level 2 Foreign currency derivatives | Sep. 30, 2013 Recurring Fair Value Measures Level 3 | Dec. 31, 2012 Recurring Fair Value Measures Level 3 | Sep. 30, 2013 Recurring Fair Value Measures Level 3 Commodity | Dec. 31, 2012 Recurring Fair Value Measures Level 3 Commodity | Sep. 30, 2013 Recurring Fair Value Measures Total | Dec. 31, 2012 Recurring Fair Value Measures Total | Sep. 30, 2013 Recurring Fair Value Measures Total Commodity | Dec. 31, 2012 Recurring Fair Value Measures Total Commodity | Sep. 30, 2013 Recurring Fair Value Measures Total Interest Rate Contracts | Dec. 31, 2012 Recurring Fair Value Measures Total Interest Rate Contracts | Sep. 30, 2013 Recurring Fair Value Measures Total Foreign currency derivatives
Recurring Fair Value Measures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset/(liability) at fair value |  |  |  |  |  | $ (11) | $ 1 | $ (11) | $ 1 | $ (5) | $ (3) | $ (22) | $ 35 | $ 16 | $ (38) | $ 1 | $ (1) | $ 4 | $ (1) | $ 4 | $ (17) | $ 2 | $ (34) | $ 40 | $ 16 | $ (38) | $ 1
Roll forward of Level 3 Net Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | 4 | 36 |  | 4 | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains/(losses) for the period: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings | (4) | (9) |  | (1) | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in other comprehensive income |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements | (1) | (4) |  | (3) | (18) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives entered into during the period |  | 1 |  | (1) | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3 (liability) |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3 (asset) |  | (14) |  |  | (9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance | (1) | 10 | 36 | (1) | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3 (asset) |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods | $ (4) | $ (8) |  | $ (1) | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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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- 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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: 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 3: 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 Reference 4: 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 + Details
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