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PROPERTIES AND ACCUMULATED DEPRECIATION | 12 Months Ended
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Dec. 31, 2016
Property, Plant and Equipment [Abstract] |
PROPERTIES AND ACCUMULATED DEPRECIATION | PROPERTIES AND ACCUMULATED DEPRECIATION
| December 31,
(Dollars in millions) | 2016 |  | 2015
Properties |  |  |
Land | $ | 157 |  |  | $ | 163 |
Buildings and building equipment | 1,256 |  |  | 1,148 |
Machinery and equipment | 9,646 |  |  | 9,333 |
Construction in progress | 640 |  |  | 590 |
Properties and equipment at cost | $ | 11,699 |  |  | $ | 11,234 |
Less: Accumulated depreciation | 6,423 |  |  | 6,104 |
Net properties | $ | 5,276 |  |  | $ | 5,130 |
Depreciation expense was $412 million, $402 million, and $355 million for 2016, 2015, and 2014, respectively. Cumulative construction-period interest of $169 million and $163 million, reduced by accumulated depreciation of $111 million and $107 million, is included in net properties at December 31, 2016 and 2015, respectively. The Company capitalized $7 million of interest in each year 2016, 2015, and 2014.

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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=64827811&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=64862545&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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