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Network
2404404 - Disclosure - FAIR VALUE - Changes in Fair Value of Assets Measured Using Significant Unobservable Inputs (Detail)
(http://www.humana.com/role/FairValueChangesInFairValueOfAssetsMeasuredUsingSignificantUnobservableInputsDetail)
TableFair Value Measurements, Recurring and Nonrecurring [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000049071 (http://www.sec.gov/CIK)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Asset Class [Axis]Asset Class [Axis]Asset Class [Axis]
Private PlacementsAuction Rate SecuritiesAsset Class [Domain]Private PlacementsAuction Rate SecuritiesAsset Class [Domain]Private PlacementsAuction Rate SecuritiesAsset Class [Domain]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
 
 
 
 
 
 
 
 
 
Beginning balance at January 1
6,000,000  
5,000,000  
11,000,000  
24,000,000  
8,000,000  
32,000,000  
24,000,000  
13,000,000  
37,000,000  
Realized in earnings
0  
0  
0  
(1,000,000) 
0  
(1,000,000) 
0  
0  
0  
Unrealized in other comprehensive income
0  
0  
0  
0  
0  
0  
0  
0  
0  
Purchases
0  
0  
0  
0  
0  
0  
0  
0  
0  
Sales
0  
0  
0  
(17,000,000) 
(3,000,000) 
(20,000,000) 
0  
(5,000,000) 
(5,000,000) 
Settlements
(2,000,000) 
(2,000,000) 
(4,000,000) 
0  
0  
0  
0  
0  
0  
Balance at December 31
4,000,000  
 
3,000,000  
 
7,000,000  
 
6,000,000  
 
5,000,000  
 
11,000,000  
 
24,000,000  
 
8,000,000  
 
32,000,000