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Properties, Plants and Equipment (Tables) | 6 Months Ended
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Jun. 30, 2016
Property, Plant and Equipment [Abstract] |
Properties, Plants and Equipment with Associated Accumulated Depreciation and Amortization | Our investment in properties, plants and equipment (PP&E), with the associated accumulated depreciation and amortization (Accum. D&A), was:
| Millions of Dollars
| June 30, 2016 |  | December 31, 2015
| Gross PP&E |  |  | Accum. D&A |  |  | Net PP&E |  |  | Gross PP&E |  |  | Accum. D&A |  |  | Net PP&E |
Midstream | $ | 7,651 |  |  | 1,477 |  |  | 6,174 |  |  | 6,978 |  |  | 1,293 |  |  | 5,685 |
Chemicals | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Refining | 21,075 |  |  | 8,256 |  |  | 12,819 |  |  | 20,850 |  |  | 8,046 |  |  | 12,804 |
Marketing and Specialties | 1,455 |  |  | 788 |  |  | 667 |  |  | 1,422 |  |  | 746 |  |  | 676 |
Corporate and Other | 1,129 |  |  | 542 |  |  | 587 |  |  | 1,060 |  |  | 504 |  |  | 556 |
| $ | 31,310 |  |  | 11,063 |  |  | 20,247 |  |  | 30,310 |  |  | 10,589 |  |  | 19,721 |

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- Definition Tabular disclosure by business segment of the depreciation and book value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References No definition available. + Details
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- References No definition available. + Details
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