Insurance (Short-Duration Contracts Historical Claims) (Details)	Dec. 31, 2019
Group Life - Term
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	78.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	20.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	0.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.00%
Group Life - Term | Asia
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	24.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	25.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	13.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	9.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	9.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	3.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	3.90%
Group Long-Term Disability
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	4.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	19.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	14.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	8.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	7.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	6.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	5.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	4.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	4.00%
Property & Casualty - Auto
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	38.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	31.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	14.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	8.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	4.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	1.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	0.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.10%
Property & Casualty - Home
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	79.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	15.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.00%
Protection Life | Latin America
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	60.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	29.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	3.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	0.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	0.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	1.00%
Protection Health | Latin America
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	86.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	11.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	0.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	(0.10%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	(0.30%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.00%