| Millions of Dollars | | | 2013 | | 2012 | | Properties, Plants and Equipment | | | | | | Proved properties* | $ | 123,012 | | 111,458 | | Unproved properties* | | 8,465 | | 8,257 | | Other | | 6,671 | | 6,464 | | Gross properties, plants and equipment | | 138,148 | | 126,179 | | Less: Accumulated depreciation | | (65,321) | | (58,916) | | Net properties, plants and equipment | $ | 72,827 | | 67,263 | | *Excludes assets held for sale reclassified to prepaid expenses and other current assets, including proved and unproved properties | | of $1,773 million and $73 million, respectively, at December 31, 2013, and $11,075 million and $234 million, respectively, at December 31, 2012. | | | | | | | |
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