Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]: Short-duration Insurance Contracts, Schedule of Historical Claims Duration (Details)	Dec. 31, 2018
Specialty Health Segment Member
Short-duration Insurance Contracts, Historical Claims Duration, Year One	64.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	29.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	1.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.80%
Group disability, life, DBL and PFL | Group Disability Product Line
Short-duration Insurance Contracts, Historical Claims Duration, Year One	17.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	22.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	7.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	3.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	2.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.40%