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2427402 - Disclosure - DEBT - Term Debt of Outstanding (Detail)
(http://www.humana.com/role/DebtTermDebtOfOutstandingDetail)
TableSchedule of Long-term Debt Instruments [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000049071 (http://www.sec.gov/CIK)
Long-term Debt, Type [Axis]Senior Notes
Debt Instrument [Line Items]Period [Axis]
2016-12-31
2015-12-31
Debt Instrument [Axis]Debt Instrument [Axis]
$500 million, 7.20% due June 15, 2018$300 million, 6.30% due August 1, 2018$400 million, 2.625% due October 1, 2019$600 million, 3.15% due December 1, 2022$600 million, 3.85% due October 1, 2024$250 million, 8.15% due June 15, 2038$400 million, 4.625% due December 1, 2042$750 million, 4.95% due October 1, 2044Debt Instrument, Name [Domain]$500 million, 7.20% due June 15, 2018$300 million, 6.30% due August 1, 2018$400 million, 2.625% due October 1, 2019$600 million, 3.15% due December 1, 2022$600 million, 3.85% due October 1, 2024$250 million, 8.15% due June 15, 2038$400 million, 4.625% due December 1, 2042$750 million, 4.95% due October 1, 2044Debt Instrument, Name [Domain]
Long-term debt
501,000,000  
304,000,000  
398,000,000  
595,000,000  
595,000,000  
264,000,000  
396,000,000  
739,000,000  
3,792,000,000  
502,000,000  
307,000,000  
398,000,000  
595,000,000  
595,000,000  
263,000,000  
396,000,000  
738,000,000  
3,794,000,000  
Senior notes
500,000,000  
300,000,000  
400,000,000  
600,000,000  
600,000,000  
250,000,000  
400,000,000  
750,000,000  
          
Debt instrument, stated interest rate
7.20%  
6.30%  
2.65%  
3.15%  
3.85%  
8.15%  
4.625%  
4.95%