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Acquisitions And Divestitures (Narrative) (Details) Share data in Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended |  | 0 Months Ended |  | 3 Months Ended
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Jun. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Jun. 30, 2013 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Jun. 30, 2014 Foreign Currency Derivatives [Member] USD ($) | Jun. 30, 2014 Canadian Conventional Assets Divestiture [Member] USD ($) | Jun. 30, 2014 Canadian Conventional Assets Divestiture [Member] CAD | Mar. 31, 2014 Canadian Conventional Assets Divestiture [Member] USD ($) | Mar. 31, 2014 Canadian Conventional Assets Divestiture [Member] CAD | Sep. 30, 2014 Canadian Conventional Assets Divestiture [Member] USD ($) | Aug. 29, 2014 LINN Energy [Member] USD ($) | Sep. 30, 2014 LINN Energy [Member] USD ($) | Sep. 30, 2014 EnLink And Partnership [Member] | Feb. 28, 2014 GeoSouthern Intermediate Holdings, LLC [Member] USD ($) acre | Sep. 30, 2014 GeoSouthern Intermediate Holdings, LLC [Member] | Mar. 07, 2014 Partnership [Member] EnLink And Partnership [Member] USD ($) | Sep. 30, 2014 Partnership [Member] Gulf Coast Natural Gas Pipeline [Member] | Nov. 02, 2014 Partnership [Member] Gulf Coast Natural Gas Pipeline [Member] Forecast [Member] USD ($) | Oct. 31, 2014 Partnership [Member] Appalachian Compression, LLC and E2 Energy Services, LLC [Member] Subsequent Event [Member] USD ($) | Sep. 30, 2014 Partnership [Member] Appalachian Compression, LLC and E2 Energy Services, LLC [Member] Subsequent Event [Member] | Sep. 30, 2014 Partnership [Member] | Sep. 30, 2014 Partnership [Member] Public Unitholders [Member] | Sep. 30, 2014 Partnership [Member] EnLink [Member] | Mar. 07, 2014 EnLink [Member] USD ($) | Sep. 30, 2014 EnLink [Member] | Sep. 30, 2014 EnLink [Member] Public Unitholders [Member] | Sep. 30, 2014 EnLink [Member] | Sep. 30, 2014 EnLink [Member] Partnership [Member] | Jun. 30, 2014 Term Loan [Member] USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment to acquire interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 163,000,000 |  |  |  |  | $ 100,000,000 |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52.00% | 41.00% | 7.00% |  | 70.00% | 30.00% | 50.00% | 50.00% |
Close date of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 07, 2014 |  | Feb. 28, 2014 |  | Nov. 01, 2014 |  |  | Oct. 01, 2014 |  |  |  |  |  |  |  |  |
Date of acquisition agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 20, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000,000 |  |  |  | 235,000,000 | 193,000,000 |  |  |  |  |  |  |  |  |  |
Partnership common units value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,825,000,000 |  |  | 30,000,000 |  |  |  |  |  |  |  |  |  |
Units issued for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 |  |  |  |  |  |  |  |  |  |
Number of acres acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains and losses on asset sales |  | (11,000,000) |  | 1,072,000,000 | (11,000,000) |  |  |  |  |  | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains and losses on assets sales after tax |  |  |  |  |  |  |  |  |  |  | 600,000,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in goodwill for sale of assets |  |  |  |  |  |  |  |  |  |  | (700,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange loss | (84,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on derivative |  |  |  |  |  | 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign earnings repatriated | 2,800,000,000 |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from property and equipment divestitures |  |  |  | 5,202,000,000 | 316,000,000 |  | 2,800,000,000 | 3,125,000,000 | 142,000,000 | 155,000,000 |  | 2,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds after tax from property and equipment divestitures |  |  |  |  |  |  |  |  |  |  |  | 1,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligation transferred |  |  |  | 949,000,000 | 15,000,000 |  |  |  |  |  | 700,000,000 | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of commercial paper | 700,000,000 |  |  | 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt repayment |  |  |  | $ 4,265,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000

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