The components of property, plant and equipment, and the related accumulated depreciation for the Predecessor and Successor periods were as follows: | | | | | | | | | | | Successor | | | Predecessor | | December 31, 2013 | | | December 31, 2012 | | (in millions) | Land | $ | 265 |
| | | $ | 330 |
| Network equipment, site costs and related software | 13,524 |
| | | 37,692 |
| Buildings and improvements | 725 |
| | | 4,893 |
| Non-network internal use software, office equipment and other | 794 |
| | | 1,860 |
| Construction in progress | 2,677 |
| | | 3,123 |
| Less: accumulated depreciation | (1,821 | ) | | | (34,291 | ) | Property, plant and equipment, net | $ | 16,164 |
| | | $ | 13,607 |
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