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Acquisitions, Investments in Unconsolidated Entities, Dispositions and Impairments - Dispositions and Divestitures (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 31, 2016 | Jun. 30, 2016 | Sep. 30, 2016
Disposed of by sale | Depreciation and amortization |  |  |
Dispositions |  |  |
Recognized gains/(losses) related to sale of assets, net |  |  | $ 99
Recognized gains related to sale of assets |  |  | 155
Recognized losses related to sales of assets |  |  | 56
Disposed of by sale | Cheyenne Pipeline LLC |  |  |
Dispositions |  |  |
Percentage of investment sold |  | 50.00% |
Disposed of by sale | STACK Pipeline LLC [Member] |  |  |
Dispositions |  |  |
Percentage of investment sold | 50.00% |  |
Held for sale | Other current assets |  |  |
Dispositions |  |  |
Assets classified as held for sale |  |  | 275
Held for sale | Goodwill | Depreciation and amortization |  |  |
Dispositions |  |  |
Impairment losses |  |  | $ 15

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