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PROPERTIES AND ACCUMULATED DEPRECIATION | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment [Abstract] |
PROPERTIES AND ACCUMULATED DEPRECIATION | PROPERTIES AND ACCUMULATED DEPRECIATION
| December 31,
(Dollars in millions) | 2015 |  | 2014
Properties |  |  |
Land | $ | 163 |  |  | $ | 175 |
Buildings and building equipment | 1,148 |  |  | 1,128 |
Machinery and equipment | 9,333 |  |  | 9,252 |
Construction in progress | 590 |  |  | 471 |
Properties and equipment at cost | $ | 11,234 |  |  | $ | 11,026 |
Less: Accumulated depreciation | 6,104 |  |  | 5,939 |
Net properties | $ | 5,130 |  |  | $ | 5,087 |
Depreciation expense was $402 million, $355 million, and $345 million for 2015, 2014, and 2013, respectively. Cumulative construction-period interest of $163 million and $162 million, reduced by accumulated depreciation of $107 million and $103 million, is included in net properties at December 31, 2015 and 2014, respectively. Interest capitalized during 2015, 2014, and 2013 was $7 million, $7 million, and $4 million, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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