The Company's property, plant and equipment and related accumulated depreciation as of December 31, 2013 and 2012 consisted of the following: | | | | | | | | | | | | | | | | | | | | Estimated | | | | | | | | | | | | | | | December 31, | | Useful | | | | | | | | | | | | | | | 2013 | | 2012 | | Lives | | | | | | | | | | | | | | | | (in millions) | | (in years) | Land, buildings and improvements(a) | $ | 1,851 | | $ | 1,778 | | 1-20 | Distribution systems(b) | | 23,119 | | | 21,141 | | 3-25 | Converters and modems | | 5,687 | | | 5,806 | | 3-5 | Capitalized software costs(c) | | 2,252 | | | 1,895 | | 3-5 | Vehicles and other equipment | | 2,286 | | | 2,214 | | 3-10 | Construction in progress | | 424 | | | 438 | | | | Property, plant and equipment, gross | | 35,619 | | | 33,272 | | | | Accumulated depreciation | | (20,563) | | | (18,530) | | | | Property, plant and equipment, net | $ | 15,056 | | $ | 14,742 | | | |
—————————— - Land, buildings and improvements includes $173 million and $170 million related to land as of December 31, 2013 and 2012, respectively, which is not depreciated. The weighted-average useful life is approximately 17.38 years for buildings and improvements.
- The weighted-average useful life is approximately 13.19 years for distribution systems.
- Capitalized software costs reflect certain costs incurred for the development of internal use software, including costs associated with coding, software configuration, upgrades and enhancements. These costs, net of accumulated depreciation, totaled $801 million and $738 million as of December 31, 2013 and 2012, respectively. Depreciation of capitalized software costs was $270 million in 2013, $237 million in 2012 and $209 million in 2011.
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