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Acquisitions and Dispositions - Dispositions and Divestitures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Dispositions |  |  |
Proceeds from sales of assets | $ 1,083 | $ 654 | $ 5
Disposed of by sale | Depreciation and amortization |  |  |
Dispositions |  |  |
Recognized gains/(losses) related to sale of assets, net | 43 | 100 | $ (2)
Recognized gains related to sale of assets | 123 | 158 |
Recognized losses related to sale of assets | 80 | 58 |
Held for sale | Goodwill | Depreciation and amortization |  |  |
Dispositions |  |  |
Impairment losses |  | 15 |
Other current assets | Held for sale |  |  |
Dispositions |  |  |
Assets classified as held for sale | $ 80 | $ 275 |
Red River Pipeline |  |  |
Dispositions |  |  |
Ownership interest disposed of | 40.00% |  |

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