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Acquisitions and Dispositions - Dispositions and Divestitures (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Dispositions |  |  |
Proceeds from sales of assets |  | $ 389 | $ 391
Disposed of by sale |  |  |
Dispositions |  |  |
Proceeds from sales of assets |  | 389 |
Held for sale | Depreciation and amortization |  |  |
Dispositions |  |  |
Recognized gains/(losses) related to sales of assets, net |  | 35 |
Held for sale | Other current assets |  |  |
Dispositions |  |  |
Assets classified as held for sale |  | $ 275 |
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% |
Non-Core Pipeline Segment | Disposed of by sale | Depreciation and amortization |  |  |
Dispositions |  |  |
Recognized gains/(losses) related to sales of assets, net |  | $ 36 |
Forecast | Non-Core Pipelines In The Rocky Mountains | Disposed of by sale |  |  |
Dispositions |  |  |
Proceeds from sales of assets | $ 250 |  |

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