Policy Claims and Benefits Policy Claims and Benefits (Schedule of Historical Claims Duration) (Details) - Life Insurance Product Line [Member]	Dec. 31, 2018
Americas [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	34.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	41.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	8.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	2.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	1.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	1.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	1.50%
Asia Pacific [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	15.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	28.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	17.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	10.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	5.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	4.80%