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Acquisitions and Dispositions - Dispositions and Divestitures (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Dispositions |  |  |
Proceeds from sales of assets |  | $ 407 | $ 638
Disposed of by sale |  |  |
Dispositions |  |  |
Proceeds from sales of assets |  | 407 |
Disposed of by sale | Depreciation and amortization |  |  |
Dispositions |  |  |
Recognized losses related to sales of assets, net | $ 15 | 15 |
Gain on sale of assets | 5 | 42 |
Losses on sale of assets | 20 | 57 |
Held for sale | Other current assets |  |  |
Dispositions |  |  |
Assets classified as held for sale | $ 630 | $ 630 |
Red River Pipeline |  |  |
Dispositions |  |  |
Interest percentage disposed of |  | 40.00% |
Red River Pipeline Hewitt Segment |  |  |
Dispositions |  |  |
Interest percentage retained after disposal |  | 60.00% |
Red River Pipeline from Ardmore to Longview |  |  |
Dispositions |  |  |
Interest percentage retained after disposal |  | 100.00% |

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