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Acquisitions and Dispositions - Dispositions and Divestitures (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Dispositions |  |
Proceeds from sales of assets | $ 161 | $ 246
Disposed of by sale |  |
Dispositions |  |
Proceeds from sales of assets | 161 |
Held for sale | Depreciation and amortization |  |
Dispositions |  |
Impairment related to assets held for sale | 31 |
Held for sale | Other current assets |  |
Dispositions |  |
Assets classified as held for sale | $ 490 |
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 |

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