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2408409 - Disclosure - Activity in Allowance for Credit Losses (Detail)
(http://www.unum.com/role/ActivityInAllowanceForCreditLossesDetail)
TableSchedule of Financing Receivable, Allowance for Credit Losses
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000005513 (http://www.sec.gov/CIK)
Class of Financing ReceivableCommercial Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit LossesPeriod [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Financing Receivable, Allowance for Credit Losses
 
 
 
Balance at Beginning of Year
0  
1,500,000  
1,500,000  
Provisions
0  
500,000  
3,000,000  
Charge-offs, Net of Recoveries
0  
(2,000,000) 
(3,000,000) 
Balance at End of Period
0  
 
0  
 
1,500,000