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Reserves for Unpaid Losses and Loss Adjustment Expenses Level 4 Average Annual Payout of Incurred Claims by Age, Group (Details)
Dec. 31, 2016
Long-term Disability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 1430.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 830.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 650.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 550.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 470.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 420.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 370.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 320.00%
Accident and Health Insurance Product Line [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 120.00%
Group Insurance Policies [Member] | Long-term Disability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 710.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 2320.00%
Group Insurance Policies [Member] | Accident and Health Insurance Product Line [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 7930.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 1870.00%