Note 11. Property, Plant and Equipment - Net
December 31, | |||||||
2013 | 2012 | ||||||
Land and improvements | $ | 376 | $ | 367 | |||
Machinery and equipment | 10,437 | 10,023 | |||||
Buildings and improvements | 3,157 | 3,045 | |||||
Construction in progress | 647 | 592 | |||||
14,617 | 14,027 | ||||||
Less—Accumulated depreciation | (9,339) | (9,026) | |||||
$ | 5,278 | $ | 5,001 |
Depreciation expense was $670, $660 and $699 million in 2013, 2012 and 2011, respectively.