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| Entity Registrant Name | HUMANA INC |
| CIK | 0000049071 |
| Accession number | 0001193125-14-058508 |
| Link to XBRL instance | http://www.sec.gov/Archives/edgar/data/49071/000119312514058508/hum-20131231.xml |
| Fiscal year end | --12-31 |
| Fiscal year focus | 2013 |
| Fiscal period focus | FY |
| Current balance sheet date | 2013-12-31 |
| Current year-to-date income statement start date | 2013-01-01 |
| Commentary | All information interpreted as expected. |
| Level 3 (Disclosure) Text Block concept | us-gaap:PropertyPlantAndEquipmentTextBlock |
7. PROPERTY AND EQUIPMENT, NET Property and equipment was comprised of the following at December 31, 2013 and 2012:
Depreciation expense was $309 million in 2013, $263 million in 2012, and $249 million in 2011, including amortization expense for capitalized internally developed and purchased software of $172 million in 2013, $151 million in 2012, and $139 million in 2011. |
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Level 4 Details Key Concepts: Long-term Debt Maturities
| Description | Fact value | US GAAP XBRL Concept |
|---|---|---|
| PPE, Gross | 2,748,000,000 | us-gaap:PropertyPlantAndEquipmentGross |
| Accumulated depreciation | 1,530,000,000 | us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
| PPE, Net | 1,218,000,000 | us-gaap:PropertyPlantAndEquipmentNet |
| CHECK | 0 |
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