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Derivatives and Risk Management Activities (Details 7) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2014 Level 3 | Jun. 30, 2013 Level 3 | Jun. 30, 2014 Level 3 | Jun. 30, 2013 Level 3 | Jun. 30, 2014 Recurring Fair Value Measures | Dec. 31, 2013 Recurring Fair Value Measures | Jun. 30, 2014 Recurring Fair Value Measures Level 1 | Dec. 31, 2013 Recurring Fair Value Measures Level 1 | Jun. 30, 2014 Recurring Fair Value Measures Level 1 Commodity Derivatives | Dec. 31, 2013 Recurring Fair Value Measures Level 1 Commodity Derivatives | Jun. 30, 2014 Recurring Fair Value Measures Level 2 | Dec. 31, 2013 Recurring Fair Value Measures Level 2 | Jun. 30, 2014 Recurring Fair Value Measures Level 2 Commodity Derivatives | Dec. 31, 2013 Recurring Fair Value Measures Level 2 Commodity Derivatives | Jun. 30, 2014 Recurring Fair Value Measures Level 2 Interest Rate Derivatives | Dec. 31, 2013 Recurring Fair Value Measures Level 2 Interest Rate Derivatives | Jun. 30, 2014 Recurring Fair Value Measures Level 2 Foreign Currency Derivatives | Dec. 31, 2013 Recurring Fair Value Measures Level 2 Foreign Currency Derivatives | Jun. 30, 2014 Recurring Fair Value Measures Level 3 | Dec. 31, 2013 Recurring Fair Value Measures Level 3 | Jun. 30, 2014 Recurring Fair Value Measures Level 3 Commodity Derivatives | Dec. 31, 2013 Recurring Fair Value Measures Level 3 Commodity Derivatives | Jun. 30, 2014 Recurring Fair Value Measures Total Commodity Derivatives | Dec. 31, 2013 Recurring Fair Value Measures Total Commodity Derivatives | Jun. 30, 2014 Recurring Fair Value Measures Total Interest Rate Derivatives | Dec. 31, 2013 Recurring Fair Value Measures Total Interest Rate Derivatives | Jun. 30, 2014 Recurring Fair Value Measures Total Foreign Currency Derivatives | Dec. 31, 2013 Recurring Fair Value Measures Total Foreign Currency Derivatives
Recurring Fair Value Measures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net derivative asset/(liability) |  |  |  |  | $ 19 | $ (24) | $ 28 | $ 16 | $ 28 | $ 16 | $ (10) | $ (37) | $ (9) | $ (59) | $ (7) | $ 26 | $ 6 | $ (4) | $ 1 | $ (3) | $ 1 | $ (3) | $ 20 | $ (46) | $ (7) | $ 26 | $ 6 | $ (4)
Rollforward of Level 3 Net Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | 1 | 1 | (3) | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains/(losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings |  | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  | 3 | (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives entered into during the period |  | 2 | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance | 1 | 4 | 1 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods | $ 1 | $ 3 | $ 1 | $ 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 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 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=28364263&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=28364263&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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- Definition Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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