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Acquisitions, Dispositions and Impairments - Dispositions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2016
Disposal Group, Not Discontinued Operations | Cheyenne Pipeline LLC |  |  |
Dispositions |  |  |
Percentage of investment sold | 50.00% |  |
Held for sale | Goodwill | Depreciation and amortization |  |  |
Dispositions |  |  |
Impairment losses |  | $ 15 |
Held for sale | Non-core assets | Other current assets |  |  |
Dispositions |  |  |
Assets classified as held for sale | $ 152 |  | $ 152
Disposed of by sale | Depreciation and amortization |  |  |
Dispositions |  |  |
Recognized gains related to sale of assets |  |  | 71
Recognized losses related to sales of assets |  |  | $ 55

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