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Acquisitions and Divestitures - Dispositions and Divestitures (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Divestitures |  |  |  |
Proceeds from sales of assets |  | $ 1,334 | $ 1,083 | $ 654
Gain on sale of investment in unconsolidated entities |  | 200 | 0 | 0
Disposed of by sale | (Gains)/losses on asset sales and asset impairments, net |  |  |  |
Divestitures |  |  |  |
Recognized gains/(losses) related to sale of assets, net |  | 120 | 43 | 100
Recognized gains related to sale of assets |  | 146 | 123 | 158
Recognized losses related to sale of assets |  | $ 26 | 80 | 58
Held for sale | Goodwill | (Gains)/losses on asset sales and asset impairments, net |  |  |  |
Divestitures |  |  |  |
Impairment losses |  |  |  | $ 15
Other current assets | Held for sale |  |  |  |
Divestitures |  |  |  |
Assets classified as held for sale |  |  | $ 80 |
Red River Pipeline |  |  |  |
Divestitures |  |  |  |
Ownership interest disposed of |  |  | 40.00% |
BridgeTex Pipeline Company, LLC (“BridgeTex”) |  |  |  |
Divestitures |  |  |  |
Ownership percentage sold | 30.00% | 30.00% |  |
Proceeds from sale of equity investments | $ 868 |  |  |
Gain on sale of investment in unconsolidated entities |  | $ 200 |  |

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